知道，知道

knockdown───adj.强有力的；可拆卸的；廉价的；n.把人打倒的一击；可拆卸的东西；击倒

unforeknown───不知道

God knows───天晓得

foreknown───v.预知

knock down───击倒；拆卸

knock on───撞击撞出；敲击（门、窗）

knock-down───击倒；拆卸

I've known him for years, but I still don't know what pushes his buttons.───我已认识他多年，可还是摸不透他的脾气。

I know a sculptor who swaps her pieces for drawings by a well-known artist.───我知道有个雕塑家用她自己的作品去换一位著名画家的画作。

I would have you to know that I am a Toad, a very well-known, respected, distinguished Toad!───我要你知道，我是一只癞蛤蟆，一只非常有名的、受人尊敬的、高贵杰出的癞蛤蟆！

Doctors say a obesity, also know known as a severe overweight, is a complex condition.