Q有这样一个句子：Some people will never learn that you can’t get something for nothing.句中的每个词我都认识,但却不知道整个句子是什么意思。（霍邱晓雪）A你之所以不理解这个句子可能是因为不懂for nothing的意思。for nothing的意思是“白白地;无代价地;徒然”,从语法上来讲,它是一个介词短语,用作方式状语。
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机译：Here are the answers. What is your question? Bayesian collaborative tag-based recommendation of time-sensitive expertise in question-answering communities
