| 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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