Go behind the hotel, knock at the correct door, walk through the hotel's busy kitchens, cross a courtyard, then knock at another locked door.

来到酒店后面，敲对某一扇门，走过酒店忙碌的厨房，穿过一个院子，再敲另一扇门。

youdao

Just then there was a knock on the door and grey-haired Mrs. Hudson appeared with the mail.

这时响起了敲门声，灰头发的哈德森太太拿着信件进来了。

youdao

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。

youdao

In lieu of presenting their evidence to a neutral magistrate, police officers may now knock, listen, then break the door down, never mind that they had ample time to obtain a warrant.

FORBES: Supreme Court Erodes 4th Amendment Protections- Eases Ability For Police To Enter Your Home Without Warrant

One February day in the mid-1990s, Mr. Tombari and his wife, then living in California, got a knock on the door from a friend.

WSJ: It Takes Planning, Caution to Avoid Being 'It'

You knock on the door once, twice, and then she opens up.

NEWYORKER: Miss Lora