hollow crank shaft

例句：

1. 1.The engine's hollow crank shaft is prone to wear and tear.
   发动机的空心曲柄轴容易磨损。
2. 2. The car's hollow crank shaft was replaced after a few months of use.
   汽车的空心曲柄轴在使用几个月后被更换了。
3. 3.The engineer carefully inspected the hollow crank shaft before installing it in the machine.
   工程师在安装机器前仔细检查了空心曲柄轴。