they're expensive knives.改为单数句
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they''reexpensiveknives.改为单数句they''reexpensiveknives.改为单数句they''reexpensiveknives.改为单数句Itisanexpensivek
they're expensive knives.改为单数句
they're expensive knives.改为单数句
they're expensive knives.改为单数句
It is an expensive knife.
或者
that is an expensive knife
it is an expensive knife