caster wheel

例句：

1. 1. The caster wheel is essential for the operation of the machine.
   轧钢机轮是该机器运行所必需的。
2. 2.The engineer designed a new caster wheel to improve efficiency.
   工程师设计了一个新的轧钢机轮以提高效率。
3. 3. The caster wheel was used to grind the metal into sheets.
   轧钢机轮被用来将金属磨成片状。