The light source must therefore be immensely brighter if it is to be used as a headlight to illuminate the path, than if it is to be used as a signal to others.

与用作被人识别的信号相比，如果用作照亮路途的头灯的话，光源必须要明亮很多。

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With the help of a compound and a light source, we're granting that cell the ability to bow out gracefully.

在光激活化合物的帮助下，我们给予该细胞消失的能力。

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The invention of the laser provided scientists with a stronger source of light and a push that could do useful work on Earth.

激光的发明给科学家们提供了一种强大的光源，同时也是地球上的一种能够产生有效功的推力。

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Called Paperwhite, the new model has a black and white screen and comes with a light source which enables reading in a dark environment.

FORBES: Amazon Kindles Tablet Price War With Revamped Range Of Tablets

Utilizing a light bulb as the light source, the light is reflected from a small DMD to the screen.

ENGADGET: D-ILA and DLP: what are they? HD

But while it lasted, work was a wellspring, a real source of light, the nurture of a beloved community.

NPR: Excerpt: 'Then We Came to the End'