at a draft

• 一口气

at a draft的用法和样例：

例句

1. I read the book at a single sitting.
   我坐着一口气将这本书读完了。
2. He blew out three candles with a single puff.
   他一口气吹灭了三根蜡烛。
3. He emptied the cup at a draught.
   他将杯中物一饮而尽。
4. He drank off a glass of beer amid their cheers.
   在他们的欢呼声中，他把杯子里的啤酒一饮而尽。