| 单词 | 拉绳 |
| 释义 | 〔ripcord〕A cord pulled to release gas from a balloon.放气裂幅拉绳：用力拉来释放汽球里气的绳索〔pulley〕A simple machine consisting essentially of a wheel with a grooved rim in which a pulled rope or chain can run to change the direction of the pull and thereby lift a load.滑轮装置：一种有一个拉绳或链子穿过的有槽的轮子且通过改变拉力的方向而拉起重物的简单机械 |
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