rarely single
很少单
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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