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。

EMMALIULIU

顶顶顶~~

九尾

有意思 帮顶 可能这里的用法涉及到不仅仅是介词 还跟estimate 和 date的用法有关？

flonacui

摘自prep语法笔记
date的固定搭配
date ...to 后面接ago 意为可追溯sth.到几年 强调发生时间点 并且to后面直接接年代数字 不需要接be
date ...at 后面与old搭配 年代鉴定 鉴别年份有。。。年之久 强调发生现在经过的时间多长
你可以参照新prep 256题

EMMALIULIU

摘自prep语法笔记
date的固定搭配
date ...to 后面接ago 意为可追溯sth.到几年 强调发生时间点 并且to后面直接接年代数字 不需要接be
date ...at 后面与old搭配 年代鉴定 鉴别年份有。。。年之久 强调发生现在经过的时间多长
你可以参照新prep 256题

-- by 会员 flonacui (2012/11/24 22:40:57)

date的用法我知道，我这里不是质疑date的用法，我是把date的用法拿出来质疑国外论坛上estimate to be 和estimate at的区别解释。

EMMALIULIU

有人来解答的咩~~~

EMMALIULIU

求解惑啊求解惑

EMMALIULIU

好多天啦，都没有解决啊~~~呼唤高手，呼喊版主！！！！

sisichen666

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

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？