Bats have an engineering problem: how to find their way and find their prey in the absence of light.

蝙蝠们遇到了一个技术上的难题：如何在没有光线的条件下认路和捕食。

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What starts as an everyday squash turns into a lantern of light.

一个平平常常的南瓜变成了一个充满光亮的灯笼。

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A sensor channels the light signal along an optical fibre.

传感器沿光导纤维输送光信号。

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The system is equipped with an ultraviolet lamp and a halogen lamp that produces near-infrared light.

VOA: special.2011.06.07

Tornadoes that cause only light damage are called an F-zero.

VOA: special.2010.05.11

Kindle Paperwhite's patented front-lit display guides light underneath an anti-glare layer and down toward the display, away from the reader's eyes.

ENGADGET: Amazon's new Kindles now available in Canada, Paperwhite starting at CAD $139

According to an analysis by the Louisiana Department of Environmental Quality, disinfecting with ferrate required onehalf the capital investment of an ultraviolet- light-based system and onethird that of an ozone-based system.

FORBES: Magazine Article

Meanwhile, numerous studies, including an in-depth federal report, confirm that red-light cameras are associated with an increase in rear-end collisions as drivers slam on the brakes.

WSJ: Jenkins: The Answer Is a Longer Yellow