请问一下at the age of 与 by the age of 的区别.还有最好给一下例句.__the age of twenty,he had written two books.

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请问一下at the age of 与 by the age of 的区别.还有最好给一下例句.__the age of twenty,he had written two books.
请问一下at the age of 与 by the age of 的区别.
还有最好给一下例句.
__the age of twenty,he had written two books.

请问一下at the age of 与 by the age of 的区别.还有最好给一下例句.__the age of twenty,he had written two books.
at the age of 在某一岁数;在……岁时
by the age of 在某一岁数之前;到……岁时
Incredibly he shot a film at the age of 17.
不可置信的是他17岁就拍了部电影.
He must learn to be independent by the age of 18.
他18岁前必须学会独立.
你补充的问题答案用by

at the age of
在…岁时
He became a doctor at the age of 27.
他27岁时成了一名医生。
by the age of
到……年龄
By the age of seven he could write beautifully.
他七岁时字就写得很漂亮了。
希望可以帮到你,谢谢~!...

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at the age of
在…岁时
He became a doctor at the age of 27.
他27岁时成了一名医生。
by the age of
到……年龄
By the age of seven he could write beautifully.
他七岁时字就写得很漂亮了。
希望可以帮到你,谢谢~!
我是一楼额。。。
答案补充:这里用by
句意为:在二十岁之前,他已经写完了这两本书。
谢谢~!记得给分哦。。不清楚再问~

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at the age of
在…岁时
by the age of
到……年龄

这里用by
在多少岁前