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单词 litmus
释义 litmus
n. a dye obtained from lichens that is red under acid conditions and blue under alkaline conditions.
Phrases and idioms
litmus paper a paper stained with litmus to be used as a test for acids or alkalis.
Etymology: ME f. ONorw. litmosi f. ON litr dye + mosi moss
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更新时间:2025/3/24 18:40:55