wheel screw

例句：

1. 1. The car has a large wheel for better traction on the road.
   这辆汽车有一个大轮子，以便在道路上有更好的抓地力。
2. 2. The old man used to push his wheelchair with his own hands.
   这位老人过去经常用手推他的轮椅。
3. 3. The train wheels are made of steel and can carry heavy loads.
   火车的轮子是用钢制成的，可以承载重载。