atprep.在；向；达n.基普(老挝货币基本单位)(=att)；[化]砹(极不稳定放射性元素)abbr.密封的(=airtight)abbr.气温(=air temperature)Atsue笃卫(名,日本)

1. He beat his opponent at one bout.
   他一下子就打败了对手。
2. She solved the problem at a stroke.
   她一下子解决了问题。
3. They threw themselves at the door together.
   他们一齐向门撞去。
4. We all made pigs of ourselves at dinner and now feel rather sick.
   吃晚饭时，我们一齐大吃大喝，现在都有点想吐。