at a blow

• adv. 立刻(突然；一下子；当机立断)

例句

用作副词 (adv.)

1. She solved the problem at a stroke.
   她一下子解决了问题。
2. He beat his opponent at one bout.
   他一下子就打败了对手。

词汇搭配

• deal a blow at someone 给某人以打击...
• blow at a cold coal 白费力气
• a cold coal to blow at 无成功希望的工作...