OG12 27中关于estimate to be 和estimated at的用法（新增国外论坛解释）

EMMALIULIU

27. Paleontologists believe that fragments of a primate jawbone unearthed in Burma and estimated at 40 to 44 million years old provide evidence of  a crucial step along the evolutionary path that led to human beings.
(A) at 40 to 44 million years old provide evidence of
(B) as being 40 to 44 million years old provides evidence of
(C) that it is 40 to 44 million years old provides evidence of what was
(D) to be 40 to 44 million years old provide evidence of
(E) as 40 to 44 million years old provides evidence of what was

之前看这道题目，og解释说estimate at是要表示发生的地点，我就这么记下了。但是今天看 DUKB24 整理的excel表格中的引用了国外论坛上的内容：
关于estimate to be 和estimate as的区别：
Q：In OG 12, Q 27 of SC, it says that the correct idiom is "estimated to be".
For eg, "The fossils of x are estimated to be y years old...."
The guide further says that "estimated at" should be used only when the author is trying is indicate a location at which the estimation was made.
But I came across a Q (given below) in GMAT Prep in which "estimated at" is used in the non-underlined portion and it is not specifying a location....
"With surface temperatures estimated at minus 230 degrees Farenheit, Jupiter's moon Europa has long been considered far too cold to support life, and with 60 square miles of water though to be frozen from top to bottom."
So suppose such a Q comes when I am taking the actual GMAT, which one should I go with...(I guess I 'll go with "estimated to be" because it's in d underlined portion but need to be sure...)
A(RON)：that's a lot of words.
here's what is actually going on here:
* "at" is a preposition.
* prepositions must be followed by nouns.
* "xxx number of years old" is not a noun.
so, wrong.
in the other example -- "temperatures estimated at xxxx degrees fahrenheit" -- there's no problem, because "xxxx degrees fahrenheit" is a noun.
i don't think anything else is happening here.
the OG explanations are wrong fairly regularly (though not in most cases); this is one of those times.
我开始疑惑了。。。如果说xxx number of years old不是名词，所以不能接在介词 at后面，要用 to be。那么，那么，那么这个句子怎么解释：
Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs have been dated at 3.47 billion years old and thus are evidence of the earliest known asteroid impact on Earth.

所以这个27题estimate to be 和estimate at的区别到底是不是如og解释所言呢？乱了乱了，到底是像og说的是at后面跟地点，还是Ron所说的因为40 to 44 million years old 不是名词，不能跟在介词at后面？但是3.47billion years old照样跟在at后面啊。

AurelieL

sisi解释的太好了，顶！

leeciyuan!

至今未搞懂

szleiye

sisi的解释好，顶起

nieyimin

顶~  有用~

15801218581

顶楼上！我就是一直以为estimate at+价格、数量等词，昨天看到曼哈顿idiom的时候三观都毁了。。

不过这个 tianwan 童鞋讲的还是挺清楚的 http://forum.chasedream.com/foru ... estimate&page=2

DesmondWang

曼哈顿SC上的idiom里面关于estimate的用法
right：She ESTIMATES the cost TO BE ten dollars.
          The cost IS ESTIMATED TO BE ten dollars.
Wrong: She ESTIMATES the cost at ten dollars.
看来曼哈顿觉得estimate at是不对的，而且做题到现在，也没看到estimate at是正确的例子。（当然也不能排除，毕竟OG没很明确的说）看到的话个人认为还是用estimate to be保险一点。

EMMALIULIU

对于estimate的用法，简单地讲：当age,cost,price,等为主语， 比如The price of the gadget is estimated at 10 $,这里The price of the gadget是The gadget的属性，可以用at/to be都行；如果属性的本体作主语——The gadget is estimated to be 10$，则只能用to be.

小结一下：属性作主语，则用estimate to/at都可以；本体做主语，则只能用estimate to

-- by 会员 sisichen666 (2012/11/28 13:26:00)

sisi这个解释貌似不错，有出处不？
顺便问下，有没有类似estimate的词也是这么用的

-- by 会员 abjure (2012/11/29 23:29:27)

好吧，这个对于estimate的解释赞。。。个么就是说og和Ron对于这个estimate to be 还是at的解释都错了咯~~~我也觉得 "xxx number of years old" is not a noun，所以不能用at，太牵强了，date at就可以击破。看来不管是OG还是大神也有错的时候啊~~~

abjure

对于estimate的用法，简单地讲：当age,cost,price,等为主语， 比如The price of the gadget is estimated at 10 $,这里The price of the gadget是The gadget的属性，可以用at/to be都行；如果属性的本体作主语——The gadget is estimated to be 10$，则只能用to be.

小结一下：属性作主语，则用estimate to/at都可以；本体做主语，则只能用estimate to

-- by 会员 sisichen666 (2012/11/28 13:26:00)

sisi这个解释貌似不错，有出处不？
顺便问下，有没有类似estimate的词也是这么用的

abjure

对于estimate的用法，简单地讲：当age,cost,price,等为主语， 比如The price of the gadget is estimated at 10 $,这里The price of the gadget是The gadget的属性，可以用at/to be都行；如果属性的本体作主语——The gadget is estimated to be 10$，则只能用to be.

小结一下：属性作主语，则用estimate to/at都可以；本体做主语，则只能用estimate to

-- by 会员 sisichen666 (2012/11/28 13:26:00)

sisi这个解释貌似不错，有出处不？