Half were housed in a standard light-dark cycle of 16 hours of light (at 150 lux) followed by eight hours of total darkness.

其中一半田鼠被封闭起来并做周期性的光照实验，每个周期先用150 勒克斯的光照持续照射16个小时，然后完全黑暗持续16个小时。

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While most spiders in nature can see only light-dark intensity and movement changes, Web spiders can see and feel using many types of protocols.

尽管自然界中的大部分蜘蛛都只能看到明暗强度和动作的变化，但是Web spider却可以使用很多种协议来看和感知。

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Over the eight-week period of the experiment the mice inthe first and third groups gained almost 50% more weight than those exposed tothe natural light-dark cycle.

经过八周的实验，相比较于第二组暴露在自然光——黑暗循环下的老鼠，第一组和第三组的老鼠体重的增长幅度高出50个百分点。

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In "Family of Man," a dark-haired, light-eyed woman with a bright blue head covering looks intensely at something hidden from view.

VOA: special.2009.11.20

Over the eight-week period of the experiment the mice in the first and third groups gained almost 50% more weight than those exposed to the natural light-dark cycle.

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"The good news is that people who stay up late in front of the television and computer may be able to undo some of the harmful effects just by going back to a regular light-dark cycle and minimizing their exposure to artificial light at night, " Bedrosian says.

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Peromyscus, too, comes in light- and dark-coat varieties as a result.

ECONOMIST: The genetics of mammoth coat colour