There are solutions that could light a path toward a more sustainable and fair farm economy.

一些解决方案可以为实现更可持续和公平的农业经济指明道路。

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The light guides my path.

圣光指引我的前路。

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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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The blue light is the product of a long travel path through the snow or ice.

VOA: special.2010.01.05

Dr Lin is already testing a waveguide designed to steer light with a wavelength of 1.5 microns, and he is also working on three-dimensional waveguides made of silicon, which will provide almost total control over the path the light takes, and make really complex optical circuits possible.

ECONOMIST: New-age crystals

They then removed some of the posts, creating a twisting path for the light to travel.

ECONOMIST: New-age crystals

Despite the fact that it is probable that a black hole lurks at the centre of our Milky Way galaxy, astronomers still know very little about these celestial monsters which vacuum up almost everything in their path, even light.

BBC: Black holes reveal more secrets