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'The Revealer' is a new machine which is used for detecting

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'The Revealer' is a new machine which is used for detecting buried gold
这句话,我觉得应该这样写“'The Revealer' is a new machine which was used for detecting buried gold.
'The Revealer' is a new machine which is used for detecting
不对
is used 被用来
是说那个东西是被用来探金的
所以不能改成was used
如果改为
was used
是说过去是用来探金的,而这里表达的只是它的用途,是一个客观事实,所以用一般现在时的被动语态就可以了
如果还哪不明白的话,我再给你讲.