effectiveness in these areas is often a good litmus test of overall quality.
在这些方面的有效是整体质量的试金石。
effectiveness in these areas is often a good litmus test of overall quality.
在这些方面的有效是整体质量的试金石。
Litmus paper turns red on contact with an acid.
石蕊试纸遇酸度会变红
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