- What is this这是什么？
- at this time of year在（一年的）这个时节里;
- at this time此时此刻;
- at this stageadv.眼下，暂时;
- at this rateadv.这样地话，这样地;
- at this point in time在这个时候
- at this point此时此刻;就此;
- at this juncture在这个当口，在这个节骨眼上;
- answer up迅速回答; 清晰地讲;直言不讳地回答; 照实回答;
- add up to总计达;<口>等于; 意味着; 总起来说;
- add up加起来; 总计;与应有的数量相符;<口>合乎情理;
- act up（病痛等）复发;炫耀;行动倔强;（机器等）功能失常;
- by this timeadv.到现在;
- by this means用这种方法;
- by the side ofadv.在…附近，和…一起比较;一旁;
- buy up全部买下;买进;
- buttoned upadj.守口如瓶的;
- button up扣紧;顺利完成;
- butter up阿谀奉承;
- bust up（尤指夫妻之间）争吵而离异;使终止，破坏;
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