circuit of the cells

例句：

1. 1. The engineer designed a new circuit to improve the efficiency of the machine.
   工程师设计了一条新的电路来提高机器的效率。
2. 2. The scientist conducted experiments to test the circuit's reliability.
   科学家进行了实验来测试电路的可靠性。
3. 3. The circuit was responsible for powering the entire city's electrical grid.
   这个电路负责为整个城市的电力网供电。