Whereas it can take several minutes for hot gas to get the ice out of the mold, a high-power electrical pulse takes about four seconds.

之前用燃气加热，需要几分钟才能把冰从模具里取出，而利用电脉冲法，只需要四秒就可以完成。

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Viewed from inside the tube, this field looks like an accelerating electrical pulse, and it is this pulse that picks up and carries the electrons-or, if the polarity is reversed, the protons.

从腔内看，此电场就如同一个加速电流脉冲，该脉冲可选中并携带电子，或在极性逆转时选中并携带质子。

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The shape, or waveform, of the electrical pulse used is crucial.

所用的电脉冲的波形非常重要。

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This means an electrical pulse can pace both ventricles, resynchronising them.

ECONOMIST: Case history

With each changing minute, an electrical pulse generates an electromagnetic field that changes the position of the crystals on the face of the watch, to elegantly display the passing time, while producing a distinctive sound unique to the Phosphor Reveal digital watch line.

ENGADGET: Phosphor's Reveal wristwatch uses Swarovski crystals to tell time, bedazzle you

Pulse-code modulation is simply a way of representing the analog electrical signal, in digital form.

ENGADGET: Primed: digital audio basics Mobile