| 单词 | 上下移动 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔chock〕Nautical A heavy fitting of metal or wood with two jaws curving inward, through which a rope or cable may be run.【航海】 导缆钳：一种金属或木制的沉重装置，有两个向内弯曲的钳口可使绳子或纲索穿于其中上下移动美国传统〔floating dock〕A dock that is supported by metal pipes on which it can move up and down with the rise and fall of the water level.浮码头：一种底部由金属管支撑并可随着水位的升降而上下移动的码头美国传统〔pump〕To move up and down in the manner of a pump handle.上下抽动：使用泵柄的方式上下移动美国传统Now, observe the way the motor causes the little wheels to move up and down.现在观察发动机是怎样带动小轮子上下移动的。剑桥国际 |
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