He also realised that varying the strength of an electric field would generate a changing magnetic field, even in empty space with no moving electric charges to speak of.
他同时认识到，变化电场强度将会产生一个变化的磁场，甚至在一个没有移动电子的空间中也是如此。
We had no time charges with which to blow the mines, but were obliged to arm with electric wires carried back to our vessel.
我们来不及控诉这作弄人的大海，我们只勉强将电线搬上了船。
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