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电路;(电流的)回路
An electrical circuit is a complete route which an electric current can flow around.
例句
Any attempts to cut through the cabling will break the electrical circuit.
只要一割断电缆，电路就中断。
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（尤指工作时的）巡回线路，巡回，巡游
A circuit is a series of places that are visited regularly by a person or group, especially as a part of their job.
例句
He joined the professional circuit...
他参加了职业巡回赛。
It's a common problem, the one I'm asked about most when I'm on the lecture circuit.
这问题很常见，我在巡回讲演时被问得最多的就是这个问题。
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赛车道
A racing circuit is a track on which cars, motorbikes, or cycles race.
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(绕着某地的)环行，环游
A circuit of a place or area is a journey all the way round it.
例句
She made a slow circuit of the room.
她绕着房间缓缓地走了一圈。