单词	litmus paper
释义	litmus paper noun : unsized paper colored with litmus and used as an indicator Example Sentences Recent Examples on the Web Liquid samples can be tested with detector paper, which is similar to a large piece of litmus paper. Popular Mechanics Editors, Popular Mechanics, 7 Aug. 2018 Word History First Known Use 1803, in the meaning defined above Kids Definition litmus paper noun lit·​mus paper ˈlit-məs- : paper treated with coloring matter that turns red in the presence of an acid and blue in the presence of a base Medical Definition litmus paper noun : paper colored with litmus and used as an acid-base indicator
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