the acid test
最严苛的考验或检验
正式或口语·表达关键考验
英文释义
a definitive test or assessment to determine the true quality or value of something
例句
The final exam was the acid test of our knowledge this semester.
典故来源
源自化学中用酸测试黄金真伪的方法,后比喻最严格的检验。