动词
中文翻译：使变灰
同义词：
['blacken', 'darken例句：1. The paint on the wall has argillified over time.（墙上的油漆已经变灰了。）']
例句：
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1. The paint on the wall has argillified over time.
墙上的油漆已经变灰了。
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2.The coal mine was argillified by the rain.
煤矿被雨水变黑了。
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3.The old tree had been argillified by the wind and rain.
这棵老树被风吹雨打变黑了。