n. 爆震音；卡答卡答的故障声音；敲的声音
v. 敲，敲打；相碰，碰撞；把……撞击成（某种状态）；敲动，打破；打，凿（洞）（knock 的现在分词）
1.The maid heard someone standing at the house-door, knocking.
女佣听到有人站在门口敲门。
2.One evening, as he was sitting in his room, there was a gentle knocking at the door.
一天晚上，他正坐在自己的房间里，有人轻轻地敲门。
3.He fell and just missed knocking the whole display over.
他摔了一跤，差一点把全部展品碰翻。
4.She pushed past me, almost knocking me over.
她从我身边挤过去，差点把我撞倒。
5.A week later, on a snowy afternoon, I heard someone knocking at the door.
一个星期后，在一个下雪的午后，我听到有人敲门。
6.At that moment, a loud knocking was heard at the door and a voice called to them, "Open!"
正在那时，有人在大声敲门，一个声音向他们喊道：“开门！”
7."You must be dreaming," said the other, "I am not knocking you."
“你一定是在做梦，”另一个说，“我没有打你。”
8.Just as they were about to sit down and eat, there was a knocking outside.
正当他们要坐下吃饭的时候，外面传来敲门声。
9."There's no sort of use in knocking," said the Footman, "and that for two reasons."
“敲门是没用的，”仆人说，“这有两个原因。”