litmus test
noun
1- Chemistry a test for acidity or alkalinity using litmus【化】石蕊试验。
1.1
- figurative a decisively indicative test〈喻〉有决定性指示作用的测试, 试金石：
effectiveness in these areas is often a good litmus test of overall quality.
这些方面的效果往往能很好地反映出整体质量。