名词
中文翻译：灰色污点
同义词：
['grey mark', 'greyspot']
例句：
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1. The oldpainting had a few grey stains onit.
这幅旧画上有几处灰色的痕迹。
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2. The floor was stained with grey stains from the spilled coffee.
地板上有从咖啡溢出的污渍造成的灰色痕迹。
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3.The stains on the wall were causedby years of neglect.
墙上的污渍是由于多年的忽视造成的。