That's because the inductor opposes the sudden change in current that was caused by the sudden voltage change.

这是因为电感器对抗由电压突变引起的电流突变。

So when the voltage changes from positive to negative, the capacitor acts as a smaller voltage source that still pushes the current along.

因此，当电压从正变为负时，电容器充当较小的电压源，仍然推动电流前进。

So when I wave my hand near the plates, you can see that the voltage changes just like the touchscreen responds to my hand.

因此，当我在板附近挥动手时，您可以看到电压发生变化， 就像触摸屏响应我的手一样。

All those voltage changes are made using transformers, which take advantage of something called mutual inductance, where a change in the current in one coil leads to a change in emf in another, nearby coil.

所有这些电压变化都是使用变压器进行的，变压器利用了一种称为互感的东西，其中一个线圈中的电流变化会导致附近另一个线圈的电动势发生变化。

So I can, say, take a piece of wood and touch one of the plates and see that not much happens, but if I take a piece of metal and touch the plate, then the voltage changes dramatically.

所以我可以，比方说，拿一块木头触摸其中一块板， 然后发现没有什么变化， 但是如果我拿一块金属触摸板，那么电压就会发生巨大变化。