the acid test
noun [ S ] uk/ˈæs.ɪd ˌtest/ us/ˈæs.ɪd ˌtest/
真正的考验;严峻的考验;决定性的考验
the true test of the value of something
It looks good, but will people buy it? That's the acid test. 看上去不错,但人们会买它吗?这才是真正的考验。
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