knock at

you're supposed to knock at the door and wait before entering the office.

进办公室之前你应该敲门。

Knock at my window at eight o'clock and I'll be ready

8点钟敲我的窗，我会准备好的。

Just when she was going to bed, there was a knock at the door.

就在她准备睡觉的时候，传来了敲门声。

He was scarcely awake when he heard the knock at the door.

他刚醒来就听见有人敲门.

I was wakened by a knock at the door.

敲门声把我吵醒了。

Just then (= at that moment) there was a knock at the door.

就在那时有人敲门了。

If opportunity does not knock at the door, build one.

如果机会不来敲门，就创造一个机会。

I should knock at the door gently.

我应该轻轻地敲门。

There was a very quiet knock at the door.

有人轻声叩门.

Knock at my window at eight o'clock and I'll be ready.

8点钟敲我的窗，我会准备好的。

Late that evening, there was a knock at the door.

那天深夜，有人敲过门。

There was a treble knock at the door.

门上响起了三声敲门声.

He was wakened by a knock at the door.

他被敲门声吵醒了。

I was preparing for bed when I heard a knock at the door.

我正准备睡觉时听到有人敲门.

They were interrupted by a knock at the door.

他们被敲门声打断了。

There had been a knock at the door and when she opened it she locked herself out.

外面有敲门声，她去开门，结果把自己反锁在了外面。

He wondered whether it would be proper to knock at her door.

他不知道敲她的门是否恰当。

Did I hear a knock at the door?

是有人敲门 吗 ?

Just at that moment there was a knock at the door.

就在那时，有人敲门。

She hid the gift immediately she heard the knock at the door.

一听见敲门声她就把礼物藏了起来.

There was a light knock at the door.

有人在轻轻地敲门。

The global economy has taken a serious knock, at huge human cost.

全球经济遭受了严重的打击, 人们为此付出了巨大代价.

They both heard a knock at the side-door.

他们俩都听见有人敲侧门.

Just as breakfast was completed there was a knock at the door.

早饭刚吃完,就有人来敲门.

There was a knock at the door. Someone had come looking for me.

门外又敲门了, 找我的.

They heard a knock at the front door.

他们听到前门有人敲门。

Who would knock at his own door if he was staying alone?

如果他一个人住，谁会敲门呢?

There had been a knock at the door and when she opened it she locked herself out

外面有敲门声，她去开门，结果把自己反锁在了外面。

It'sounds as though there is a knock at the door.

听起来好像有人在敲门.

I wish you wouldn't knock at the table again.

我希望你不要再敲桌子了。