people keep their nose out of other people’s business这句话应该怎么理解

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• people keep their nose out of other people’s business这句话应该怎么理解
• people keep their nose out of other people’s business这句话应该怎么理解
• 英语翻译1 What‘protection’ did Chicago gangsters give to those who paid them?a．They saved those people's businesses from destruction.b．They left those people's business premises unharmed.c．They protected those people against criminals like Sir John Hawkwood.d．They did not take those people's lives.但这句话我不太理解,应该怎么翻译呢?b．They left those people's business premises unharmed.课文在这:
• 三角函数解三角形面积
• 若向量a=（1，1），b=（2，5），c=（3，x）满足条件（8a-b）•c=30，则x=（　　） A.6 B.5 C.4 D.3