你说“应该”，我们怎么知道这种动生电磁感应确有其事？
You said should. How could we know this "motional induction" is happening?
上次，我们提到过动生电磁感应：海洋产生磁场的一种现象。
Last time, we talked about "motional induction," a phenomenon by which the ocean generates a magnetic field.
上次，我们提到过动生电磁感应：海洋产生磁场的一种现象。
Last time, we talked about "motional induction," a phenomenon by which the ocean generates a magnetic field.
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