推杆

例句：

1. 1. The car's engine is a powerful push rod that can accelerate the car quickly.
   这辆车的引擎是一个强大的推杆，可以迅速加速汽车。
2. 2. The scientist used a lever to lift heavy objects without bending his back.
   科学家使用杠杆举起重物，而没有弯曲他的背。
3. 3. The engineer designed a new lever system for the machine to improve its efficiency.
   工程师设计了一种新的杠杆系统来提高机器的效率。