There was a sharp knock on the door.
敲门声大作。
You don't have to knock—just walk in.
不必敲门—进来就是了。
They heard a knock at the front door.
他们听到前门有一敲门声。
They were interrupted by a knock at the door.
他们被敲门声打断了。
Late that evening, there was a knock at the door.
那天深夜，有人敲过门。
He rushed into the room without troubling to knock.
他连门也懒得敲就闯进屋去。
I was so involved in my book I didn't hear you knock.
我全神贯注在看书，没听到你敲门。
No sooner had I sat down than there was a loud knock on the door.
我刚坐下就有人大声敲门。
There was a knock at the door.
门外传来敲门声。
You should knock before you enter.
你进来前应先敲门。
Nothing remained to do but to knock.
只需要敲门了。
Suddenly there was another knock at the door.
突然，又有人敲门。
For long there was no answer, then again the knock.
很长时间没有回答，然后又是敲门声。
Deeply involved in his book, he didn't hear my knock.
他沉浸于书本，没有听到我的敲门声。
Who would knock at his own door if he was staying alone?
如果一个人呆着，谁会去敲自己的门呢？
Just when she was going to bed, there was a knock at the door.
正当她要上床睡觉时，有人敲门。
Just as breakfast was completed there was a knock at the door.
早饭刚吃完，有人敲门。
Ring the doorbell or knock at the door before you enter the room.
在你进入房间之前，按一下门铃或敲门。
They knock on their neighbours' doors and shout "trick or treat".
他们敲了他们邻居家的门，然后喊着“不给糖就使坏”。
If there is anything I can do for you, you just knock on my door.
如果有需要我帮忙的地方，直接敲我的门。
No sooner had she fallen asleep than she heard a knock at the door.
她刚睡着就听到了敲门声。
They waited in silence, and presently there came another lighter knock.
他们默默地等着，不一会儿，又传来了一阵比较轻的敲门声。
He hurt his shoulder not long ago, trying to knock ripe mangoes from a tree.
不久前，他试图把成熟的芒果从树上敲下来，弄伤了肩膀。
They managed to knock a hole in the wall.
他们设法在墙上凿了个洞。
They had to knock the door down to get in.
他们不得不破门而入。
He was scarcely awake when he heard the knock at the door.
他刚醒来就听见有人敲门。
我们都在下午三点下班。
The elephant can knock down a man with his trunk.
大象能用鼻子把人撞倒。
He got a nasty knock on the head.
他头部遭到重重一击。
咱们收工吃午饭吧。
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