flat rim

例句：

1. 1.The car's flat rim caught the light and shone brilliantly.
   汽车的平坦边沿在光线下闪闪发光。
2. 2.The chef used a flat rim to cut the vegetables into uniform pieces.
   厨师用一个平坦的边沿将蔬菜切成均匀的片。
3. 3. The flat rim of the helmet protected her head from injury.
   头盔的平坦边沿保护了她的头部免受伤害。