Because the source of the energy stops, the electrical current stops -just as a light bulb turns off when you switch off the electricity running to it.

因为一旦能量的来源被切断了，电流就会被切断——就好像当你关上开关，切断电流的时候，灯泡会立刻熄灭一样。

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Because the source of the energy stops, the electrical current stops - just as a light bulb turns off when you switch off the electricity running to it.

因为一旦能量的来源被切断了，电流就会被切断——就好像当你关上开关，切断电流的时候，灯泡会立刻熄灭一样。

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"What's really novel is that this laser works in the opposite mode, where most of the time the light is on, but it turns off in very brief flashes, very brief dark pulses," said Wiener.

这种激光器的相反工作模式才是它真正的新奇之处，其中大部分时间光线是打开的，但它在很短的闪烁及非常短暂的暗脉冲里关闭。

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The photoswitch turns the glutamate receptor on or off by changing its shape depending on the wavelength of light used a technique that's been shown to induce light sensitivity in blind mice.

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We're keen on the fbt, a phone designed for braille text messaging, and the Tap, which is shaped like a light switch and functions like one too -- when you tap it, the phone turns off so you can live once again in peace.

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