更常用的标准改法为：
= They are used to see in the dark.
它们被用于在暗处观看.
即：be used for doing sth = be used to do sth 被用于做某事
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They are used for seeing in the dark.改为同义句
They are used for seeing in the dark.改为同义句
英语人气：527 ℃时间：2019-12-10 14:53:39
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