at least至少;at present现在;at a loss茫然;at a time 每次;
at all一点也不;at all costs 不惜一切代价; at all times 随时;
at first最初;at first sight初看起来;at heart 内心里;
at one point 在某一时刻;at large详细的;在逃的;
at the cost of 以..为代价;at work 在工作
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