axle|axles

自行车的轮子通过一根金属轴连接到车架上。

The bicycle's wheels are connected to the frame by a metal ___axle.

我们需要更换这辆推车的损坏车轴。

We need to replace the damaged ___axles in this cart.

货车的车轴需要定期检查以确保安全。

The truck's ___axles need regular inspection to ensure safety.