名词
中文翻译：蓝色污渍
同义词：
['blue spot', 'blue mark']
例句：
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1.The tablecloth had a blue stain on it from the spilled drink.
桌布上有一块蓝色的污渍，是饮料洒在上面的。
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2. The paint was not applied evenly, leaving a blue stain on the wall.
油漆没有均匀涂抹，在墙上留下了一块蓝色的污渍。
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3. The stain is difficult to remove and requires professional cleaning.
这块污渍很难去除，需要专业的清洁。