动词
中文翻译：使变黑
同义词：
['darken', 'stain', 'tarnish']
例句：
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1.The paint on the wall has blackened over time.
墙上的油漆已经随着时间变黑了。
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2. The shoes have blackened from years of use.
鞋子因为多年的使用而变黑了。
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3. The car's paint has blackened due to exposure to the sun.
由于暴露在阳光下，汽车的漆已经变黑了。