名词
中文翻译：碱斑
同义词：
['alkaline stain', 'alkaline spot例句：1. The fabric was stained by a drop of acid from the chemical spill.（这件衣物被化学泄漏中的一滴酸染色了。）']
例句：
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1. The fabric was stained by a drop of acid from the chemical spill.
这件衣物被化学泄漏中的一滴酸染色了。
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2. The stain on his shirt is caused by eating too much salt.
他衬衫上的污渍是因为吃太多盐造成的。
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3.The stain on the wall is due to the leakage of the water pipe.
墙上的污渍是由于水管漏水造成的。