A third group are known as crepuscular: they thrive in the low light of dawn and dusk and remain inactive at other hours.

第三组被称为黄昏组：他们在黎明和黄昏的微光中茁壮成长，而在其他时间则不活跃。

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Most of the time the lasers are dark, producing areas of light with low intensities with the occasionally brief but brilliant flashes of high - intensity light.

大部分的时间里激光是暗的，产生低强度的光区伴随着偶尔短暂的高强度光的闪烁。

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In both cases, high concentrations of the gas are dark, while low concentrations are light.

在两幅图中，气体密度越高的区域颜色也就越深，低密度区则更浅。

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They are very light, that is to say, low mass.

很轻，也就是说，质量很小。

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They will be closed only for short periods of time and only during the winter when the water temperature and light are too low for algal blooms.

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There are many older optical fibers, but low-light-loss ones are vital for telephone cable.

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Armed with this technology, the new PENs are outstanding low-light performers with a maximum ISO of 25, 600 and a dynamic range that has also been increased, enabling finer expression of gradations between dark and bright areas with a wider range of intensity.

ENGADGET: Olympus E-PL5 and E-PM2: Micro Four Thirds cameras with OM-D-like focusing, performance boosts (hands-on)