circular fiber

例句：

1. 1.The circle of light around the tree is beautiful.
   围绕树木的光环很美丽。
2. 2. The map shows a circular route around the city.
   地图显示了环绕城市的环形路线。
3. 3. The car was driving in a circular motion.
   汽车在绕圈运动。