[求助]885 SecE-23
A new phenomena, which is visible at Managua’s major intersections, are waves of vendors and beggars, which include many children and mob cars at the stoplights.
(A) A new phenomena, which is visible at Managua’s major intersections, are waves of vendors and beggars, which include many children and
(B) Visible at Managua’s major intersections are waves of vendors and beggars with many children, new phenomena that
(C) A new phenomenon visible at Managua’s major intersections is waves of vendors and beggars, many of them children, who
(D) Phenomenally new waves of vendors, beggars, and many children are visible at Managua’s major intersections, which
(E) A wave of vendors and beggars, many of whom are children, are visible at Managua’s major intersections, where they are a new phenomenon and
Correct answer: C
I know the mistakes in the other choices. but why C is right since " A new phenomenon visible...is waves of.....
Why "is" plus plural "waves".
Thank you!
以A为例：
1－A new phenomena，单个名词；
2－which is visible at Managua's major intersections，定从修饰前置名词phenomena；
3－are waves of vendors and beggars，主句谓宾部分；
4－which include many clildren and mob cars at the stoplights，定从（原文意图）修饰前置名词vendors and beggars；
A的错误在2部分（定从n, + which be + a.一般情况下可以被a. + n.替代【注：除了逻辑或平行结构需要】）；3部分主谓一致；4部分which定从的指代不明确，不如C中用同位语+明确定从who好。
STONEREN: "4－which include many clildren and mob cars at the stoplights，定从（原文意图）修饰前置名词vendors and beggars；A的错误在2部分（定从n, + which be + a.一般情况下可以被a. + n.替代【注：除了逻辑或平行结构需要】）；3部分主谓一致；4部分which定从的指代不明确，不如C中用同位语+明确定从who好。"
Thank Stoneren for your explanation. But I still do not understand the last part of C. When I put it in the sentence.I am confused by " many of them children,who" how to connect [ mob cars at the stoplights. In meantime, what's the meaning about " many of them children",bty, could u please tell me the relationship between them and children? Thank you very much
我认为 "many of them children" 是同位语, 可理解为 "many of them (are) children". "Them" 指代"vendors and beggars", 后面的 who 也指代 "vendors and beggars".
who 修饰的是beggars, 不是vendors
vendor是自动售卖机，就是路边那个大箱子，都见过吧。
还有，关于wave作为名词的解释是
n 1: one of a series of ridges that moves across the surface of a liquid (especially across a large body of water) [syn: moving ridge]
2: a movement like that of an ocean wave; "a wave of settlers"; "troops advancing in waves"
3: (physics) a movement up and down or back and forth [syn: undulation]
4: something that rises rapidly; "a wave of emotion swept over him"; "there was a sudden wave of buying before the market closed"; "a wave of conservatism in the country led by the hard right" ---这句中，显然是这个意思。
5: the act of signaling by a movement of the hand [syn: waving, wafture]
6: a hairdo that creates undulations in the hair
7: an undulating curve [syn: undulation]
8: a persistent and widespread unusual weather condition (especially of unusual temperatures)
9: a member of the women's reserve of the United States Navy; originally organized during World War II but now no longer a separate branch [syn: Wave]
第二页看不到？还是不明白啊
1。我认为Vendor是兜售小商品的小商贩。小商贩和乞丐围着车...
2。答案C如果没有who更象正确答案。原句则为A phenomena ... is (that) waves...mob cars
请N人们再答疑啊，多谢多谢！
vendor是自动贩卖机，就是你投进去几块前的硬币，给你瓶饮料的那种
choice C : A new phenomenon visible at Managua’s major intersections is waves of vendors and beggars, many of them children, who mob cars at the stoplights.
的结构是 a new phenomenon +形容词短语做定语+ is waves of verdors and beggars,同位语修饰beggars, + who引导的非限制性定语从句修饰 children.
谢谢Colacat...不过还有疑问：
1。Vendor: 看来我是为中国国情所累，以为Vendor即小商贩，因为常见些小贩在红灯时围着车卖小东西。OK，当它是自动贩卖机吧。
2。如果结构是“ a new phenomenon +形容词短语做定语+ is waves of verdors and beggars,同位语修饰beggars, + who引导的非限制性定语从句修饰 children”，那么该句即可简化为：A new phenominon is waves of vendors and beggars. (就不是表语从句了）这样一来，“is”怎么不该是"are"？
a+N 当然是单数了，所以是is
即使是简化，也是主系表结构，也不是表语从句啊
明白了，谢谢。
wave + s 待研究....
waves是做n
of +n and n介宾短语做定语修饰waves
我觉得Vendors是小商贩的意思，在十字路口那，车辆等红灯时，商贩和乞丐会围上来，而当中不少是儿童
i can not understand why is a phenomenon visible. why not a visible phenomenon?
it depends on which part you want to emphasize.
for example, "A new phenomenon visible at...." emphasizes "Phenomenon"
"A new visible phenomenon" emphasizes "visible phenomenon", which means that there are already some other "visible phenomenons" and this is a new one, which just does not make too much sense...
hopefully this will be helpful.
赞成!
VENDOR:SOMEONE WHO SELLS THINGS.郎文辞典是这样解释的。所以many of them chilren是vendors and beggers的同位语，who作非限制性定语从句修饰chilren.
另外，定语从句中主+系即that+be/which+be为了简洁，应尽量省！
vendor 应该还是小贩的意思
自动贩卖机是vendor machine
i can not understand why is a phenomenon visible. why not a visible phenomenon? 形容词短语( visible at Managua’s major intersections )做定语后置, 不可单独提前visible ,如果都提前修饰语序有误 |
choice C : A new phenomenon visible at Managua’s major intersections is waves of vendors and beggars, many of them children, who mob cars at the stoplights.
的结构是 a new phenomenon +形容词短语做定语+ is waves of verdors and beggars,同位语修饰beggars, + who引导的非限制性定语从句修饰 children.
有两点不同意，第一，vendors指小商贩而不是自动售货机（美国也没有一建国就有自动售货机啊），第二，who修饰的是 vendors and beggars，而不是children。
choice C : A new phenomenon visible at Managua’s major intersections is waves of vendors and beggars, many of them children, who mob cars at the stoplights.
的结构是 a new phenomenon +形容词短语做定语+ is waves of verdors and beggars,同位语修饰beggars, + who引导的非限制性定语从句修饰 children.
many of them children 是独立主格(相当于一非限定性定语从句many of whom are children), 补充说明vendors and beggars(vendors 当然指人啦, 机器怎能在路口呢!)
who从句修饰children
第一，vendors指小商贩而不是自动售货机（美国也没有一建国就有自动售货机啊），第二，who修饰的是 vendors and beggars，而不是children。
I agree.
who从句修饰children? If that was the case, the sentence should be written as something like,
"... waves of vendors and beggars, many of whom are children that mob cars at the stoplights."
Use a comma to set off parenthetical elements, as in "The Founders Bridge, which spans the Connecticut River, is falling down." By "parenthetical element," we mean a part of a sentence that can be removed without changing the essential meaning of that sentence. The parenthetical element is sometimes called "added information." This is the most difficult rule in punctuation because it is sometimes unclear what is "added" or "parenthetical" and what is essential to the meaning of a sentence.
我觉得这个题最痛苦的就是要理解 waves of .... 可以作为一种现象(单数), 把这点想通了, 整体一读, C 就是最顺的了.
好题, 感谢楼主!
Henry
举例说明：
All the students each have a bright future.
主语 同位语 谓语
a. 谓语与宾语不存在搭配关系。have a bright future.
b. 主语与同位语不存在搭配关系。Students each
c. 同位语与谓语不存在搭配关系。 Each have
举例说明：
All the students each have a bright future.
主语 同位语 谓语
a. 谓语与宾语不存在搭配关系。have a bright future.
b. 主语与同位语不存在搭配关系。Students each
c. 同位语与谓语不存在搭配关系。 Each have
精辟！
谓语和宾语无所谓主谓一致，所以可以是a phenomenon ... is waves of ...
(A)中的phenomena也是错的。
在没复习GMAT之前，我会认为WHO mob...中的who修饰vendors and beggars, 但是复习后（尤其是做完og后），我认为ETS在出现定从时更加prefer，尤其是定从前有“，”时，这个定从是修饰 “，”前离定从最近的那个单词的，此句中即：children.
不知道我的这个观点对不对，我认为弄清这个很重要，og上有很多选项考这个，向大家求证确认！！！谢谢！！！
NICE, THANKS
这个不对吧。这是个简单句呀，简化后的结构就是
A new phenomenon is waves of vendors and baggers.
其余部分都是修饰成份呀，哪里有宾语从句呢？而且我记得按ETS的要求，宾语从句的引导词THAT基本上是不能省略的呀。
举例说明：
All the students each have a bright future.
主语 同位语 谓语
a. 谓语与宾语不存在搭配关系。have a bright future.
b. 主语与同位语不存在搭配关系。Students each
c. 同位语与谓语不存在搭配关系。 Each have
没错！那么，现在的问题是：如果主谓都是复数，宾语在什么情况下用单数，什么情况下用复数呢？
举例说明：
All the students each have a bright future.
主语 同位语 谓语
a. 谓语与宾语不存在搭配关系。have a bright future.
b. 主语与同位语不存在搭配关系。Students each
c. 同位语与谓语不存在搭配关系。 Each have
没错！那么，现在的问题是：如果主谓都是复数，宾语在什么情况下用单数，什么情况下用复数呢？
但是主语和宾语是存在搭配关系的吧,如果主语是抽象名词, 那么宾语该怎么搭配?
在没复习GMAT之前，我会认为WHO mob...中的who修饰vendors and beggars, 但是复习后（尤其是做完og后），我认为ETS在出现定从时更加prefer，尤其是定从前有“，”时，这个定从是修饰 “，”前离定从最近的那个单词的，此句中即：children.
不知道我的这个观点对不对，我认为弄清这个很重要，og上有很多选项考这个，向大家求证确认！！！谢谢！！！
对于这样的主系表结构的的系动词的单复数形式是由主语决定的，而不是标语。e.g. the greatest asset of the university is its excellent students.
his fault is many wrong words at the wrong time. 仅供参考。
But I still do not understand the last part of C. When I put it in the sentence.I am confused by " many of them children,who" how to connect [ mob cars at the stoplights. In meantime, what's the meaning about " many of them children",
而且我觉得vendor应该是小贩不是自动售货机。
哪位NN帮忙回答一下。
who 修饰的是beggars, 不是vendors
vendor是自动售卖机，就是路边那个大箱子，都见过吧。
还有，关于wave作为名词的解释是
n 1: one of a series of ridges that moves across the surface of a liquid (especially across a large body of water) [syn: moving ridge]
2: a movement like that of an ocean wave; "a wave of settlers"; "troops advancing in waves"
3: (physics) a movement up and down or back and forth [syn: undulation]
4: something that rises rapidly; "a wave of emotion swept over him"; "there was a sudden wave of buying before the market closed"; "a wave of conservatism in the country led by the hard right" ---这句中，显然是这个意思。
5: the act of signaling by a movement of the hand [syn: waving, wafture]
6: a hairdo that creates undulations in the hair
7: an undulating curve [syn: undulation]
8: a persistent and widespread unusual weather condition (especially of unusual temperatures)
9: a member of the women's reserve of the United States Navy; originally organized during World War II but now no longer a separate branch [syn: Wave]
Thanks for the explanation.
Howeverm there is a fault I would like to point out.
Vendor
应该是指路边的那种兜售东西的小贩。就像北京秀水街外面，上海襄阳路外面兜售皮包和手表的小贩。有两点不同意，第一，vendors指小商贩而不是自动售货机（美国也没有一建国就有自动售货机啊），第二，who修饰的是 vendors and beggars，而不是children。
Totally agree
Let's Fight,
Demon Hunter
精辟！
谓语和宾语无所谓主谓一致，所以可以是a phenomenon ... is waves of ...
(A)中的phenomena也是错的。
All the students each have a bright future.
为什么不说
All the students each have bright future.
为什么宾语要用单数？
请
Let's Fight,
Demon Hunter
不理解为什么这里可以用 many of them children
我不能确定这是不是独立主格
独立主格不是应该
名词(代词)+现在分词、过去分词；
名词(代词)+形容词；
名词(代词)+副词；
名词(代词)+不定式；
名词(代词) +介词短语构成。
似乎没有 名词+名词
请教NN，3Q
我的理解：
vendor 应该还是小贩的意思，自动贩卖机在美国是vending machine。
vendors and beggars，小贩和乞丐，非常对称。
many of them children，是插入语，who修饰vendors and beggars。
choice C : A new phenomenon （visible at Managua’s major intersections） is waves of vendors and beggars, {many of them children}, who mob cars at the stoplights.
同意
看到帖子，我想请教：phenomenon和phenomena有何区别？
只存在主谓搭配，主语同位语、同位语谓语、还有谓语和宾语是没有搭配关系的，所以is waves没有错
看到帖子，我想请教：phenomenon和phenomena有何区别？
STONEREN: "4－which include many clildren and mob cars at the stoplights，定从（原文意图）修饰前置名词vendors and beggars；A的错误在2部分（定从n, + which be + a.一般情况下可以被a. + n.替代【注：除了逻辑或平行结构需要】）；3部分主谓一致；4部分which定从的指代不明确，不如C中用同位语+明确定从who好。"
Thank Stoneren for your explanation. But I still do not understand the last part of C. When I put it in the sentence.I am confused by " many of them children,who" how to connect [ mob cars at the stoplights. In meantime, what's the meaning about " many of them children",bty, could u please tell me the relationship between them and children? Thank you very much
Because one sentence can have only one subject. It sounds like properer to add a "are" in "many of them children,who". But if thus,the sentence would have double subjects.One is "A new phenomenon" and another is "many of them ". Therefore,"many of them " is used for modifier. It equals "many of which are". The subordinate clause inducted by who decorates children.
看到帖子，我想请教：phenomenon和phenomena有何区别？
不理解为什么这里可以用 many of them children
我不能确定这是不是独立主格
独立主格不是应该
名词(代词)+现在分词、过去分词；
名词(代词)+形容词；
名词(代词)+副词；
名词(代词)+不定式；
名词(代词) +介词短语构成。
似乎没有 名词+名词
请教NN，3Q
不理解为什么这里可以用 many of them children
我不能确定这是不是独立主格
独立主格不是应该
名词(代词)+现在分词、过去分词；
名词(代词)+形容词；
名词(代词)+副词；
名词(代词)+不定式；
名词(代词) +介词短语构成。
似乎没有 名词+名词
请教NN，3Q
在白勇的语法书里面有 n.+n. 的独立主格结构哦！
这里用的是独立主格结构没有错！
A new phenomena, which is visible at Managua’s major intersections, are waves of vendors and beggars, which include many children and mob cars at the stoplights.
***"which" here is a wrong pronoun for "venders and beggars", some person
(A) A new phenomena, which is visible at Managua’s major intersections, are waves of vendors and beggars, which include many children and
*** Ditto, "which" is an unacceptable pronoun for people
(B) Visible at Managua’s major intersections are waves of vendors and beggars with many children, new phenomena that
*** the first half is the perfect sentence construction--inverted clause enlivens the expression; however, in the second half, the completion phrase is illogical in that "a phonomena" CAN NOT mob cars. Grammatically, nothing is wrong here; but logically, the sentence makes nonsense.
(C) A new phenomenon visible at Managua’s major intersections is waves of vendors and beggars, many of them children, who
*** It can picked up as the better devil from the five since others may suffer more grammatically or logically. There is something still to be perfected, i.e., rather than "many of them children", the better, more standardized expression should be "many of whom are children". MBA dotcom, sometimes, is cunning and tricky.
(D) Phenomenally new waves of vendors, beggars, and many children are visible at Managua’s major intersections, which
*** This is the worst expression from five: after reading the sentence, can we make any sense out of it? Confusing as it is, the sentence conveys nothing than confusion.
(E) A wave of vendors and beggars, many of whom are children, are visible at Managua’s major intersections, where they are a new phenomenon
*** The sentence suffers from the agreement between the subject "a wave" and "are"; futher, at the end of construction, the expression is illogical.
Maybe the better expression conveying the similar information could be constructed as:
Visible at Managua’s major intersections are waves of vendors and beggars, many of whom (are) children, who mob cars at the stoplights.
Whether the "are" here could be UNDERSTOOD is rather debatable. Checking with some of MBA dotcom's grammar rules, it seems necessary that an "ARE" be here to meet the canon of King's English; however, from some editorials' article, it may, sometimes, be omitted.
there should be another fault in A.
which can not refer to a person, so which should be replaced with who.
right?
还是不明白WHICH修饰谁,感觉象是修饰vendors and beggars,但是发现OG11VERBAL REVIEW sc73里有一段话: relative pronouns, such as which, should follow as closely as possible the nouns to which they refer. 糊涂了!!!
relative pronouns, such as which, should follow as closely as possible the nouns to which they refer.
糊涂了!!!
谓语肯定要跟着主语了，主语是a phenonmenon, 谓语当然是is 了，waves of ******是一种情况，而不是很多浪花，没有矛盾。
不过NN说的all the students each have a dream ,感到奇怪， 这句话本身就是错误的吧，all the students each has a dream 。 ？
求解
谓语肯定要跟着主语了，主语是a phenonmenon, 谓语当然是is 了，waves of ******是一种情况，而不是很多浪花，没有矛盾。
不过NN说的all the students each have a dream ,感到奇怪， 这句话本身就是错误的吧，all the students each has a dream 。 ？
求解
个人想法
第一层关系：A new phenomena,[主语] is[谓语] 主谓单复数一致 waves of vendors and beggars [宾语]
第二层关系：visible at Managua's major intersections [形容词短语，后置定语，修饰主语] many of them children [独立主格，修饰vendors and beggars] who...[定语从句，修饰vendors and beggars]
另外应该注意，
名词+独立主格+定语从句，则定语从句修饰名词，本句就是这种情况
名词+同位语+定语从句，则存在就近原则，定语从句修饰同位语
STONEREN: "4－which include many clildren and mob cars at the stoplights，定从（原文意图）修饰前置名词vendors and beggars；A的错误在2部分（定从n, + which be + a.一般情况下可以被a. + n.替代【注：除了逻辑或平行结构需要】）；3部分主谓一致；4部分which定从的指代不明确，不如C中用同位语+明确定从who好。"
Thank Stoneren for your explanation. But I still do not understand the last part of C. When I put it in the sentence.I am confused by " many of them children,who" how to connect [ mob cars at the stoplights. In meantime, what's the meaning about " many of them children",bty, could u please tell me the relationship between them and children? Thank you very much
beggars = many of them = children
逗号后面的many of them 紧跟同位语children结构很紧凑，共同修饰beggars，如果用many of them are children稍显啰嗦
我想请问NN一个问题， water and books 谓语动词应该用单数还是复数？ food and water 谓语动词应该用单数还是复数？
books and food谓语动词应该用单数还是复数？ book and desk 谓语动词应该用单数还是复数？books and desk 呢？
我想的比较简单。
我觉得这句话的结构就是sth(A) is sth(B)的结构。a new phenomenon is weaves.。
然后weaves连接of+名词，表示限定或修饰，后面的many of them children是插入语，who引导定于从句修饰beggers。
我想请问NN一个问题， water and books 谓语动词应该用单数还是复数？ food and water 谓语动词应该用单数还是复数？
books and food谓语动词应该用单数还是复数？ book and desk 谓语动词应该用单数还是复数？books and desk 呢？
A and B 结构, 谓语动词都用复数
A new phenomena, which is visible at Managua’s major intersections, are waves of vendors and beggars, which include many children and mob cars at the stoplights.
我理解的是：which修饰phenomena,"are"不对，应改为is，这样主谓一致。第二个which修饰 vendors and beggers. 原句中可以看出include和mob是平行并列形式，发出者是vendors and beggers.(所以C中who指代的是vendor and beggers )
我的问题是：如果改为 a new phenomena , which is visible at Managua's magor intersection, is waves of vendor and beggars,who include many children and mob cars at the stoplights. 这样可不可以呢，会有歧义吗？我没看出，
或者改为 ......vendor and beggars, including many children and mobbing cars in the stoplights. 这样可以吗？我不太清楚，如果不对，是因为，改为including....的话，including其修饰主语是phenomena吗？
谢谢~
咦？这帖子沉淀太久了吗？没有人回答我。。。大家快看那
A new phenomena, which is visible at Managua’s major intersections, are waves of vendors and beggars, which include many children and mob cars at the stoplights.
我理解的是：which修饰phenomena,"are"不对，应改为is，这样主谓一致。第二个which修饰 vendors and beggers. 原句中可以看出include和mob是平行并列形式，发出者是vendors and beggers.(所以C中who指代的是vendor and beggers )
我的问题是：如果改为 a new phenomena , which is visible at Managua's magor intersection, is waves of vendor and beggars,who include many children and mob cars at the stoplights. 这样可不可以呢，会有歧义吗？我没看出，
或者改为 ......vendor and beggars, including many children and mobbing cars in the stoplights. 这样可以吗？我不太清楚，如果不对，是因为，改为including....的话，including其修饰主语是phenomena吗？
确实，are应该改成is。原句的第二个which是优先指代waves，但是waves include many children逻辑不对。
后面改为who以后，who也只指代beggars而不能指代vendors andd beggars.
改为including many children也是不对的...including短语做定语修饰waves，前面是主系表，Ing短语在句尾只做定语，因为不能伴随。
ps:你对这句话的改动有点大...没必要这么改...只要弄清楚ing短语和定语从句的修饰关系就可以。关于修饰关系，OG上说得很清楚。
我觉得vendors还是作为小摊贩讲比较好，这样意义上才能和作为乞丐讲的beggars并列，而且如果是贩卖机怎么会有children呢。
PS我们都叫贩卖机vending。
who个人认为是修饰vendors and beggars的。都好中间的是插入。
本题目中 many of them children 为什么不加一个动词are呢？
这个用法在OG89中，使用则是有is。二者有啥子区别？
89.
Presenters at the seminar, one who is blind, will demonstrate adaptive equipment that allows visually impaired people to use computers.
(A) one who
(B) one of them who
(C) and one of them who
(D) one of whom
(E) one of which
Idiom
The writer is trying to include information regarding one of the presenters at the seminar; the phrase must correctly refer back to presenters. The pronouns who or whom should be used to refer to people. In this situation, the correct pronoun is whom because an objective case pronoun must be used following the preposition of
A One who could only be used after an introductory word such as including
B One of them who is awkward and ungrammatical
C And creates the impression that the blind presenter is not part of the group; one of them who is awkward and ungrammatical
D Correct. This sentence uses the proper objective pronoun whom; the phrase clearly conveys the idea of one person out of a larger group.
E The pronoun which can only refer to objects, events, or unnamed animals; it cannot be used to refer to people
The correct answer is D.
有两个问题：
1. 就是句子中：phenomena是复数名词，为什么可以用a new phenomena来修饰呢？
这样不是表示一个单数的形式了么。
2. 就是C选项中的who mob the cars at the stoplights. 这里到底是就近指代children,还是指代‘vendors and baggars'.
谢谢。
[countable]
1
someone who sells things, especially on the street
news vendor/ice-cream vendor etc He bought a copy from a newspaper vendor.the shouts of street vendors
2
formal or law someone who is selling something
leading software vendors
这是longman四版的原文解释。应该是小商贩吧~
谓语肯定要跟着主语了，主语是a phenonmenon, 谓语当然是is 了，waves of ******是一种情况，而不是很多浪花，没有矛盾。
不过NN说的all the students each have a dream ,感到奇怪， 这句话本身就是错误的吧，all the students each has a dream 。 ？
求解
主谓一致中，复数名词/复数代词+EACH +VERB,谓语动词用复数。
这个白勇的书里P50页有写。
[求助]885 SecE-23
A new phenomena, which is visible at Managua’s major intersections, are waves of vendors and beggars, which include many children and mob cars at the stoplights.
(A) A new phenomena, which is visible at Managua’s major intersections, are waves of vendors and beggars, which include many children and
(B) Visible at Managua’s major intersections are waves of vendors and beggars with many children, new phenomena that
(C) A new phenomenon visible at Managua’s major intersections is waves of vendors and beggars, many of them children, who
(D) Phenomenally new waves of vendors, beggars, and many children are visible at Managua’s major intersections, which
(E) A wave of vendors and beggars, many of whom are children, are visible at Managua’s major intersections, where they are a new phenomenon and
Correct answer: C
I know the mistakes in the other choices. but why C is right since " A new phenomenon visible...is waves of.....
Why "is" plus plural "waves".
Thank you!
几个问题明确一下
1、vendor 这里应该是小贩，和beggar 形成并列关系。
2、主谓一致即可，同位语和谓语，谓语和宾语未必要保持一致，前面一位NN的例子： all the students each have a bright future,举的很好。
这里主语是 a phenomenon,谓语应该是单数
3、(C) A new phenomenon 【visible at Managua’s major intersections】 is 【waves of vendors and beggars,（ many of them children,） who mob cars at the stoplights】
正确的句子应该是这个。
我的理解是：
a new phenomenon is waves:句子主干
【visible at Managua’s major intersections】:形容词短语后置修饰主语
,（ many of them children,） ：插入语，补充说明 vendors and beggars
【vendors and beggars who mob cars at the stoplights】：WAVE的同位语，解释说明WAVE的，。
请高手指正。
顺便提个问题:
one of them children
one of whom are children
one of whom children
三者什么区别？
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