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.

youdao

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.

youdao

烟尘使那幢建筑物变黑了。

The building is dark with soot and smoke.

youdao