1. (physiology) the normal equilibrium between acids and alkalis in the body. 
   （生理学）人体内酸和碱的正常平衡。
2. absorbent paper full of litmus; it is turned red by acids and blue by alkalis. 
   充满石蕊的吸水纸；遇酸变红遇碱变蓝。
3. Any of a large class of sour-tasting substances whose aqueous solutions are capable of turning blue litmus indicators red, of reacting with and dissolving certain metals to form salts, and of reacting with bases or alkalis to form salts. 
   酸任何一类酸性的物质，它的水溶液可以使蓝色石蕊试纸变红，与金属反应或溶解金属时可形成盐，和碱反应亦可形成盐
4. a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation). 
   可溶于碱性冷水中的无色气体（o），强氧化剂，可通过在氧气中放电产生，亦可通过紫外线作用于平流层中的氧而获得。

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