柯林斯词典carbonic acid 1. N a weak acid formed when carbon dioxide combines with water: obtained only in aqueous solutions, never in the pure state. Formula: H2CO3 碳酸 返回 carbonic acid剑桥词典a weak acid made of carbon dioxide dissolved in water 碳酸（二氧化碳气体溶于水而生成的一种弱酸） 返回 carbonic acid