Normally when we are sad, we will wear dark colored clothes.

通常当我们心情不好时，我们会穿颜色灰暗的衣服。

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An urban heat island is created when dark colored man-made materials used in the construction of a city absorb the sun's rays and release that energy back out as heat.

深色的人造建筑材料吸收太阳辐射，并将获取的能量以热量的形式释放出来，城市“热岛效应”随即产生。

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Signs of dehydration include fatigue, flushed skin, heat intolerance, light-headedness and dark colored urine.

FORBES: Death from Dehydration

Due to the limited number of electrodes, patients would only be able to discern light or dark, but most have reported better functionality with the device -- being able to make out the shape of a curb while walking, or discerning between light, grey or dark colored socks, for instance.

ENGADGET

One wore a dark baseball cap, a light collarless shirt and a dark-colored jacket.

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