单词：sheave block
sheave block的用法和样例：
例句
- Large sheave mounted on sealed ball bearings for high efficiency.安装在密封滚珠轴承上的大型滑轮，有相当出色的效率。
- Seize together,as of parallel ropes of a tackle in order to prevent running through the block.把滑车的平行绳子牢牢抓住，以免滑车通过滑轮转动。
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