litmus
英
['lɪtməs]
美
['lɪtməs]
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Noun:
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a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator
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用作名词 (n.)
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Litmus paper turns red in the presence of an acid.
石蕊试纸遇到酸就变红。
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A sense of control is the litmus test for success.
自我控制能力是成功的试金石。
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海词词典,十七年品牌