circuit on side of overhead contact line

例句：

1. 1. The engineer designed a new circuit for the computer.
   工程师为计算机设计了一个新的电路。
2. 2. The power company has to maintain the integrity of its circuits.
   电力公司必须保持其电路的完整性。
3. 3.The scientist used a circuit to detect the presence of radiation.
   科学家使用一个电路来检测辐射的存在。