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望各位大哥大姐帮下忙Infactories,robotscontrolledbycomputerscandoworkthatisdangeroustohumans.这里的robotscontrolledbycomputers应该是被动语态,那么robots后面为什么没加are呢?

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望各位大哥大姐帮下忙
In factories,robots controlled by computers can do work that is dangerous to humans.这里的robots controlled by computers 应该是被动语态,那么robots后面为什么没加are呢?
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robots controlled by computers的确是被动语态,不过在这个句子中是被动语态作定语,controlled by computers前省略了which/that are,它修饰说明的对象是robots,是英语里常见的语法.整个句子的主语是robots can do wo...