1. litmus paper turns red on contact with an acid. 
   作家要接触真实的生活。
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 various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt. 
   各种水溶性的化合物，有酸味，能将石蕊变红，和碱反应可形成盐。
4. 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
5. unsized paper treated with litmus for use as an acid-base indicator. 
   未定尺寸经石蕊处理的纸，用作酸碱显示剂。

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