litmus paper
短语[化] 石蕊试纸 [医] 石蕊试纸
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词形变化
litmus papers
复数
litmus papers
释义与例句
n.
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1.
paper containing a water-soluble pH indicator composed of a mixture of different dyes extracted from certain lichens. The resulting piece of paper is used to test materials for acidity, turning red when acidic and blue when alkaline.
石蕊试纸
可数 不可数 化学