Litmus paper can be used as an indicator of the presence of acid in a solution.

石蕊试纸可用以测试溶液是否含酸.

辞典例句

We test the liquid for acidity with a strip of litmus paper.

我们用一条石蕊试纸来试验这液体是不是酸性的.

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Litmus paper turns red on contact with an acid.

石蕊试纸遇酸度会变红.

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Test: turns blue litmus paper red.

做个试验吧,能把蓝色的石蕊试纸变成红色.

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They turn blue litmus paper red.

他们把蓝色石蕊试纸变红.

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Ammonia gas NH 3 is colorless which can turn wet red litmus paper to blue.

氨气是无色的,它可把湿的红色石蕊试纸变成蓝色.

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