knuckle drive

例句：

1. 1. The car'sengine is knuckle-driven, so it's easy to start.
   这辆车的引擎是膝盖驱动的，所以很容易启动。
2. 2. The old man used todrive a knuckle-driventruck.
   这位老人以前开过一辆膝盖驱动的卡车。
3. 3. The knuckle-driven wheelchair allows the user to movearound more easily.
   膝盖驱动的轮椅使用户更容易移动。