社会学家欧文·高夫曼将此描述为“光线变暗的一种类型”。
Sociologist Erving Goffman describes this as "a kind of dimming of lights".
例如，他们不能解释水是怎样使土壤变暗的。
They cannot, for example, explain how the water darkened the soil.
这是导致“全球变暗”的主要原因之一。全球变暗的现象始于1970年，是空气中的浮质(悬浮微粒)增加所致。
It is a major reason for "global dimming", which has been caused by an increased amount of aerosols in the air since 1970.
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