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单词 上下拉动手柄
释义 DEFINITIVE EXAMPLES 权威例句You use a plunger by putting the rubber piece over the opening of a blocked pipe, and moving the stick up and down, which produces pressure and suction alternately, dislodging whatever is blocking the pipe.将手压皮碗泵的皮碗放在被堵塞的管道的口上,上下拉动手柄,这样就会交替产生压力和吸力,疏通管道任何被阻塞的地方。剑桥国际
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