名词
中文翻译：酸
同义词：
['acidic', 'acidulous', 'acidity']
例句：
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1. The chemical reaction is very sensitive to the presence of water.
这种化学反应对水的存在非常敏感。
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2. The acid in the solution has a pH of 2.
溶液中的酸的pH值为2。
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3. Acids are used to dissolve metals and other non-metals.
酸用于溶解金属和其他非金属。