before you could say knife

• 一下子

before you could say knife的用法和样例：

例句

1. I can't say offhand how much money I earn.
   我一下子说不上来我挣多少钱。
2. He ripped the letter open with a knife.
   他用刀子一下子把信裁开了。
3. You changed into a costume in the blink of an eye.
   一眨眼工夫连衣服都换好了。
4. Affinity casts three spells before blinking, and the Goblin decks often do likewise.
   共鸣连眨眼工夫都用不上，一回合就能出来三个咒语，精灵也类似。
5. You want to see a doctor at once.
   你必须马上去看医生。
6. I could hardly wait to pay him a visit.
   我真想马上去拜访他。

词汇搭配

• before you could say Jack knife 马上
• before you could say "knife" 说时迟那时快...