| 单词 | piston |
| 释义 | piston n 1 round plate or short cylinder,usu made of metal or wood, that fits closely inside another cylinder or tube and moves up and down or backwards and forwards inside it; used eg in steam or internal combustion engines to cause other parts to move by means of a connecting rod (`piston-rod) 活塞. =>illus 见插图. 2 sliding valve in a trumpet or other brass wind instrument （铜管乐器上的）活门. |
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