knock down 撞倒；击落；拆除knock out 敲出(击倒,打破,打落) knock at 敲(门、窗)knock off 敲掉；击倒；停工 no-knock (逮捕、搜查等)强行闯入进行的, 破门而入的 knock over 撞倒;撞翻 knock into 撞上 knock-dow...