reciprocating shaft

例句：

1. 1. The machine has a reciprocating shaft that moves the piston up and down.
   这台机器有一个往复式轴杆，可以上下移动活塞。
2. 2.The engineer designed the reciprocating shaft to efficiently transfer power from the motor to the wheels.
   工程师设计了往复式轴杆，以高效地将动力从电机传递到车轮。
3. 3. The reciprocating shaft is crucial for the smooth operation of the machine.
   往复式轴杆对于机器的平稳运行至关重要。