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。

youdao

Diligency is a key factors to be successful. As long as you knock at door long and loud enough, someone will answer it.

坚韧是成功的一大要素，只要在门上敲得够久、够大声，终会把人唤醒的。

youdao

I had gone downstairs at three o 'clock to fetch a jug of water; and was passing through the hall with it in my hand, when a sharp knock at the front door made me jump.

我在三点钟下楼去拿一罐水，正在提着水罐走过大厅时，这时前门一阵猛敲使我吓一跳。

youdao

The 22-year-old answered a knock to the front door of her home in Third Avenue in Luton at 13:10 GMT on Thursday.

BBC: Knife-wielding raider robs woman in her Luton home

Every day of the four-day safari started at 5 a.m. with a brusque knock and tea and biscuits delivered to my door.

FORBES: Losing My Virginity on Safari