在过去几年里日益关注人们，以及特别是青少年，过度使用日光浴浴床使皮肤变黑，这在社会角度被认为是可取的。
There has been mounting concern over the past several years that people and in particular, teenagers are using sunbeds excessively to acquire tans which are seen as socially desirable.
屏幕变黑了；他通过加上褐色使颜色变暗了。
The screen darkened; he darkened the colors by adding brown.
设计者倾向于控制程序是显而易见的，在程序中通过使菜单项和控件变灰或变黑，不断的试图控制用户的走向。
GUI designers' predilection for control is evident in applications that continually attempt to control user navigation by graying and blackening menu items or controls within an application.
彻底美白？纯净美白因子有效淡化肤色，调节导致肌肤变黑的黑色素形成，有助改善晦暗肌肤，使肌肤变得洁白无瑕，焕发净。
Thoroughly whiten: Pure whitening factor can effectively fade tone, restrain the production of melanin, powerfully fade dull tone and make skin white, clear and shining.
在18世纪，鼠海豚被描述为非常普遍的，他们有时使海水变黑，因为它们生长是靠喘气。
In the 18th century, porpoises were described as so common they sometimes darkened the sea as they rose to draw breath.
黑色素使皮肤变黑是人被晒黑的原因。
黑色素使皮肤变黑是人被晒黑的原因。
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