circular conductor

例句：

1. 1. The circle of lightcast by the moon is breathtaking.
   月亮投下的光圈令人叹为观止。
2. 2.The car was driving in a circular patharound the lake.
   汽车在湖边绕了一个圆环行驶。
3. 3. The circuit board iscircular and has many connections.
   电路板是圆形的，有许多连接点。