| 单词 | litmus | 
| 释义 | litmus [`lit·mǝs]  MATERIALS Blue, water-soluble powder from various lichens, especially Variolaria lecanora and V. rocella; turns red in solutions at pH 4.5, and blue at pH 8.3; used as an acid-base indicator. Also known as lacmus; lichen blue.  | 
	
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