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He replaced a dud valve.是什么意思？

He replaced a dud valve.

他换掉了坏阀门。

相关词汇
he replaced dud valve

he

pron. 他，它，一个人；n. 雄性动物；

replaced

v. 取代( replace的过去式和过去分词 )，更换，把…放回原位，（用…）替换；

dud

n. [军]哑弹，无用的人或物，衣服，个人物品；adj. 无用的，不完善的；

valve

n. 阀，真空管，（管乐器的）活栓，（心脏的）瓣膜；vt. 装阀于，以活门调节；
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