traveling block

• 游动滑车

traveling block的用法和样例：

例句

1. The travelling block is one of the most useful rig parts.
   游动滑车是最有用的钻机部件之一。
2. The companion blocks to these pulleys are the traveling blocks.
   与这些滑轮组相连接的滑车称为游动滑车。