differential windlass

differential-windlass的词性：
n.（名词）

1. A hoisting device that has two drums of different sizes on the same axis. A line wound on the larger and unwound from the smaller provides extra lifting power.Also called Chinese windlass
差动卷扬机：一种起重设备在同一个轴上有二个不同尺寸的卷线轴，卷线在尺寸的一边，尺寸小未绕的一边可以提供额外的提升力也作 Chinese windlass