其它物体只有在处于永久磁铁或电磁铁形成的磁场中时才具有磁性。

Other objects become magnetic only when in a magnetic field caused by a permanent magnet or an electromagnet.

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其它物体只有在处于永久磁铁或电磁铁形成的磁场中时才具有磁性。

Other objects become magnetic only when in a magnetic field caused by a permanent magnet or an electromagnet.

youdao