knockonn.撞击(打出的粒子)adj.撞击的(被打出的粒子)
knockv.敲击;互撞;攻击n.敲;敲门;敲打
knock down good money挣很多钱
knocked off a bank.抢劫银行
knock-down argument使人无法反驳的论据
knock one's block off
knocking down the bar碰倒横杆
knocking-over verge脱圈栅状齿口
knock-out personnel[机] 清箱员
knock Priscian's head
Knock yourself out.我们一醉方休。
knock at the entrance敲门