They are used for seeing in the dark.改为同义句
问题描述：
They are used for seeing in the dark.改为同义句
答
We can use them to see in the dark.
答
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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