1.at present=at the present time 目前 for the present 暂时 2.once or twice 一两次 more than once 不止一次 3.once more 重新 once upon a time 从前 once in a while 偶尔 4.at n...
1、目标:Present most interesting stories for a user at a given time Interesting = topical relevance + social relevance + timeliness Stories = questions + answers 2、主要使...
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