There was a ring at the door.

门铃响了。

《牛津词典》

Someone was beating at the door.

有人在打门。

《牛津词典》

There's someone at the door.

门口有个人。

《牛津词典》

The darkness made Olive nervous and she stood at the door not sure what to do.

VOA: special.2010.01.09

He says, "Sin couches at the door; Its urge is toward you Yet you can be its master," Genesis 4:7.

上帝说，罪恶在门外召唤;,它能控制你,你却不能成为他的主人，《创世纪》第4章第7节。

耶鲁公开课 - 旧约导论课程节选

As I told the teaching fellows, I had a colleague in those days who looked at me enviously and said he wished he had the black leather concession at the door.

我跟学生讲，有个同事特别羡慕我,希望自己的门上也有那样的黑色皮革。

耶鲁公开课 - 文学理论导论课程节选

Shaking now from terror, she knew better than to look at the door, but couldn't help herself.

NPR: Excerpt: 'Killer Weekend'

Mr Demirsay, known locally as Sharif, was stabbed after answering a knock at the door.

BBC: Serafettin Demirsay

As he was answering the last few letters, he heard a hesitant knock at the door.

NEWYORKER: Waiting