电流在这个完整的电路中流动。

The current flows around a complete ___circuit.

短路导致电路过载，并触发了安全开关。

A short circuit caused the ___circuit to overload and trip the safety switch.

工程师仔细检查了印刷电路板上的每一个电路。

The engineer carefully inspected every ___circuit on the printed circuit board.