Apart from the tiny current trickling through its filament, the secret of the Centennial Light's long life is that it has rarely been turned off.

除了通过“世纪灯”灯丝的电流微弱外，这盏灯长寿的秘诀在于人们很少关掉它。

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Think about a light bulb; if you apply a current, the filament gets hot and begins to give off light of different colors - red then yellow then blue.

试想下灯泡，如果接通了电流，灯丝会变热继而发出不同颜色的光-从红到黄再到蓝色。

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The resistance of the metal-filament lamp increases, and that of the carbon-filament lamp decreases with increase of current.

随着电流的增加，金属丝灯泡的电阻是增加的，而碳丝灯泡的电阻是减小的。

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Many of the tiny metal pieces are cut with a new mechanical process that runs electric current through a hair-thin filament.

FORBES: Time Is Money