弱酸是和强酸相对的酸，酸性较弱
另外，在地表水中存在一种弱酸，它是碳酸，而不是硫酸，而且是能帮助溶解岩石的碳酸。
Also, in surface water, there is a weak acid, carbonic acid, not sulfuric acid, but carbonic acid that helps dissolve the rock.
皮肤具有天然弱酸性，pH值为5.5。
这两种都是酸。前者是强酸，后者是弱酸。
Both compounds are acids, the former is strong and the latter is weak.
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