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And while the argument over including such features rarely rests on a single variable, it is important to know which will resonate with decision-makers.

在争论这类特征很少取决于一个单一变量时，重要的是找到哪一点能与决策制定者产生共鸣。

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Results are rarely about a single factor, and a single factor doesn't always produce the same results.

结果很少是由单一因素造成的，单一因素并不总是引起相同的结果。

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Rego says that because a bad mood rarely has a single cause, there is no single treatment.

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These events are widely advertised and rarely have even a single security guard or police officer.

WSJ: Shooting Spurs Calls for Security, Civility

People rarely act with a single purpose in mind.

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