The design scheme of door security system based on ARM9 was presented.

提出了一种基于ARM9处理器的快速人脸检测门禁系统设计方案；

youdao

For reasons of security the door is always kept locked.

为了保证安全，门总是锁着的。

《牛津词典》

You meet new people every day: the grocery worker, the cab driver, new people at work or the security guard at the door.

你每天都会遇到新朋友：杂货店员工、出租车司机、新同事或门口的保安。

youdao

Security forces have also launched a door-to-door search for members of the group.

VOA: standard.2009.07.30

He says the current U.S.strategy of pushing for a two-state solution is not winning support from Israelis who want to see a partition but are worried about Israel's security with Palestinians running their own state next door.

VOA: standard.2009.10.31

This "looking through" I interpret as similar to the way the door security guy at a posh night club "looks through" you as you attempt to persuade him your are on the guest list.

BBC: The beginnings of 'financial repression'?

The red metal security door that is used to close up the stall in the evenings is pockmarked with dozens of bullet holes.

NPR: Film Adds Fuel to Venezuela's Social Fires

Aid workers are hoping the U.N. will have an easier time getting the governments of the Central African Republic and Chad to open the door for better security.

NPR: U.N. Weighs Force to Protect Darfur Aid Efforts