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
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
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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We can use them to see in the dark.