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.
移除由于混浊的瑕疵而变暗的晶体，通常叫做白内障，然后用人工晶体替换它们，这种技术已经存在超过半个世纪。
The ability to remove lenses darkened by cloudy imperfections, known as cataracts, and replace them with artificial lenses, is more than half a century old.
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