1. before you can say knife : 突然；
及物动词
不及物动词
名词
1. edge tool used as a cutting instrument
has a pointed blade with a sharp edge and a handle
2. a weapon with a handle and blade with a sharp point
3. any long thin projection that is transient
e.g. tongues of flame licked at the walls
rifles exploded quick knives of fire into the dark
Synonym: tongue