They had proven that different tones would vary the strength of an electric current in a wire.
他们已经证明，不同的声调，不同强度的电流在一个丝。
In the accelerating field, every unit adjusts its current by electric field strength, the total current remaining constant.
在加速场区，各单元按场强调整电流值，但电流总量不变。
They measured the strength of an electric current.
他们测量了电流的强度。
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