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stopcock
stɒpkɒk ˈstɑpˌkɑk
Word forms: plural stopcocks
N-COUNT 活塞;活栓;旋塞阀 A stopcock is a tap on a pipe, which you turn in order to allow something to pass through the pipe or to stop it from passing through. 活塞;活栓;旋塞阀
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