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。
In that very instant, a loud knock sounded on the door.
就在这一刹那，有人在敲门。
Late that evening, there was a knock at the door.
那天深夜，有人敲过门。
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。
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 sharp knock on the door.
敲门声大作。
They had to knock the door down to get in.
他们不得不破门而入。
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。
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？
Suddenly there was another knock at the door.
突然，又有人敲门。
Just as breakfast was completed there was a knock at the door.
早饭刚吃完，有人敲门。
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。
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。
There was a knock at the door.
门外传来敲门声。
He was scarcely awake when he heard the knock at the door.
他刚醒来就听见有人敲门。
While he was half asleep, he seemed to hear a knock on the door.
蒙胧中他仿佛听到有人敲门。
At that moment there came a tolerably violent knock on the door.
这时，有人在门上敲了一下，并且敲得相当凶。
If there is anything you need, just knock on my door.
有什么需要帮忙的话，尽管敲门来找我。
There was a sudden knock on the door, then he lost his train of thought.
突然而来的敲门声打断了他的思绪。
Knock, and the door will be opened.
敲门，门就会被打开。
At that moment there came a knock at the door.
正在这时，有人敲门了。
At that point her husband happened to knock on the door.
就在这时她的丈夫正好回来敲开房门。
If you don't answer when I knock, I try the door.
如果在我敲门的时候你没有应答，我就试着撬开它。
Months later, I heard a loud knock at my door.
几个月后，我听见有人用力敲我的家门。
门上响起一阵敲门声。
There was a knock at the door. She opened it.
敲门声响起，玛丽修女把门打开了。
The next day, just before noon, a knock on my door woke me.
第二天，将近中午时分，粗重的敲门声吵醒了我。
我敲了敲门。
我敲了敲门。
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