... electro-magnet brake 电磁闸 electro-magnet coil 电磁线圈 Telegraph electro-magnet 电报电磁体 ...
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Another is to put a little coil of wire on top of a pigeon's head and use an electric current from a small battery to make an electro-magnet.
另一项实验是在鸽子的头顶端绕上一个小金属线圈并用一小块电池发出的电流制成的一个电磁体。
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