轴

例句：

1. 1. The car's steering wheel is connected to the engine by a metal shaft.
   汽车的方向盘通过一根金属轴与发动机相连。
2. 2. The clock's hands are driven by a geared shaft.
   时钟的指针由一个齿轮轴驱动。
3. 3. The machine's mechanism relies on a precise alignment of its shafts.
   这台机器的机制依赖于其轴的精确对齐。