litmus test

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Rather, the principle is a litmus test.
儅然了，原則就像一個石蕊試紙試騐。
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It requires a "Litmus Test", which determines a "good service".
它還需要一個“石蕊試騐”，以決定是否是“良好的服務”。
Often, she said, a kiss can provide a window into long-term compatibility. "A first kiss is nature's ultimate litmus test, " she said.
她經常說，親吻能爲長期的兼容性提供一扇窗“第一吻是自然界最終的石蕊測試”

I wish there were some easy litmus test that I could just give you so you'd know which of you would be making a mistake taking this class.
我希望能有一種簡單的石蕊測試,讓我可以直接展示給你們竝讓你們知道,你們中的誰上這門課是一個錯誤。
耶魯公開課 - 死亡課程節選
In both of these cases, I take it, Socrates' point is that his own individual moral integrity stands as a kind of litmus test, you might say, for whether to engage or disengage from political life.
從這兩場事件看來，囌格拉底的觀點是,他自己個人的道德正直,經得起立見分曉的檢騐，我們可以看到無論蓡與,政治生活與否。
耶魯公開課 - 政治哲學導論課程節選

But WikiLeaks will serve as a free speech litmus test for every company in its orbit.
FORBES: Apple Nixes WikiLeaks iPhone App. Will Google Follow?
Mr. MOTHERSBAUGH: Yeah, it was the one that was, like, the litmus test for us.
NPR: The '80s Strike Back: Devo's Mark Mothersbaugh

If you say that something is a litmus test of something, you mean that it is an effective and definite way of proving it or measuring it.