ADJ (of a compound) containing carbon, esp tetravalent carbon (化合物中)含碳的; 特别是四价碳
With a little help from this carbonic acid, moving water forms most of the world's limestone caves.
在这种碳酸的帮助下，流动的水创造了世界上大部分的石灰岩洞穴。
Also, in surface water, there is a weak acid, carbonic acid, not sulfuric acid, but carbonic acid that helps dissolve the rock.
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。
Once in the water, it reacts to form carbonic acid.
二氧化碳一旦进入水中，就会发生反应形成碳酸。
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