right angle crank

例句：

1. 1. The right angle crank is essential for the operation of the machine.
   直角曲柄对于机器的运行至关重要。
2. 2.The right angle crank was used to adjust the gears on the car.
   直角曲柄被用来调整汽车上的齿轮。
3. 3.The right angle crank helped me to lift the heavy box without bending my back.
   直角曲柄帮助我举起了沉重的箱子，而没有弯下我的背。