You said should. How could we know this "motional induction" is happening?
你说“应该”，我们怎么知道这种动生电磁感应确有其事？
This is very strong evidence that motional induction is real... and the ocean has its own magnetism.
这正是磁场感应存在的真凭实据，海洋确实有自己独特的磁力。
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。
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