①at + 名词/形容词
at all (完全,根本) not at all (一点也不)
at one's convenience(方便时)
at hand (在手边,附近,即将到来) at intervals (不时,间隔一定时间) at least (至少,最低限度)
at length (最终;详细地)
at (the) most(至多,不超过) at present (目前)
at any rate (无论如何,至少)
at a sitting (一口气地,连续地) at table (吃饭)
at no time (从不,决不) at times (有时)
at will (随意)
at (the) best (充其量,至多)
at all costs [events] (无论如何) at heart (在内心,实质上)
at large (一般,大体上;详细地;自由地) at leisure (闲暇)
at a loss (困惑,不知所措) at once (突然;同时,一起) at random (随意地)
at first sight (乍一看,初看起来) at stake (在危险中,利害攸关)
at a time (每次,一次) at one time (同时,曾经)
at one's wits' end(智穷计尽,无计可施) at (the) worst (在最坏的情况下)
②过去分词/形容词 + at clever at (擅长于) slow at (对⋯迟钝) mad at (对⋯恼火)
delighted at (因⋯愉快) quick at (对⋯反应敏捷) skillful at (灵巧,娴熟) annoyed at (对⋯生气) astonished at (因⋯惊奇)