before you can say knife的用法和樣例：
例句
- I must say the news comes as a total surprise.
我得說(shuō)這個(gè)消息來(lái)得太突然了。 - He suddenly drew a knife and threatened me with it.
他突然拔出刀來(lái)威脅我。
詞匯搭配
- before you can say "knife" 說(shuō)時(shí)遲那時(shí)快...
- before you can say Jack knife 馬上
