shaft deepening

例句：

1. 1. The car's engine is located on the front shaft.
   汽车的引擎位于前轴上。
2. 2. The machine tool has a long shaft for easy handling.
   这台机床有一根长轴便于操作。
3. 3. The drill bit fits perfectly into the shaft of the drill.
   钻头完美地嵌入了钻机的轴中。