名词
中文翻译：碱斑
同义词：
['alkali spot', 'alkaline spot']
例句：
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1.The chemical reaction produced a noticeable alkaline spot on the surface of the metal.
化学反应在金属表面产生了一个明显的碱斑。
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2.The doctor found an alkaline spot on his fingernails after using too much soap.
医生发现他的指甲上有一个碱斑，这是由于使用肥皂过多造成的。
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3. The alkaline spot was caused by the acid rain that had washed over the city.
这个碱斑是由酸雨引起的，酸雨已经洗刷过这个城市。