knock off和 knock over 有什么不同答:knock off :1,撞倒(常用简单时态)eg,please knock off your ash before it fails on the carpet .2,停止,中断(off 作介词用,不用被动语态)eg,when the bell rings at 12 o'clock ,all the works knock off for lunch.3,减去,扣除(常用简单时态)eg,I'll take both dress if you ...