I also own a piece of copper wire that was used 160 years ago as a conductor for the original Morse telegraph system.
我还有一根铜丝，那是160年前最早的摩尔斯电报系统曾用过的导体。
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A current can also be induced by constantly moving a permanent magnet in and out of a coil of wire or by constantly moving a conductor near a stationary permanent magnet.