plain steel rim

例句：

1. 1. The car's rim is made of high-quality steel for a long lifespan.
   这辆车的轮圈是用高质量的钢材制成的，以延长使用寿命。
2. 2. The new model has a sleek and plain steel rim that catches the eye.
   新款模型拥有光滑且平直的钢边，引人注目。
3. 3. The old car had a rusty and plain steel rim that needed to be replaced.
   旧车有一个生锈且平直的钢边，需要更换。