litmus test

• 决定性的检验或指标，用来揭示某事物的真实性质、质量或可接受性，常用于决策或评估的语境中。

A decisive test or indicator that reveals the true nature, quality, or acceptability of something, often used in decision-making or evaluation contexts.

1. Decisive indicatorB2formal

   A situation or event that reveals the true character or nature of something or someone.

   试金石

   • The election was a litmus test for the new policy.
   • His reaction to the crisis was a litmus test of his leadership.
   • This project will be a litmus test for our team's capabilities.

2. Chemical testB2formal

   A test using litmus paper to determine if a substance is acidic or basic.

   石蕊试验

   • The litmus test turned red, indicating the solution was acidic.
   • In chemistry class, we performed a litmus test on various liquids.
   • A blue litmus test turning red shows the presence of an acid.