"We had hospitals with wards overflowing with women with septic abortions and those wards have all been closed.

VOA: standard.2010.06.24

We don't say anything about implicitly here, we're talking about a closed system, so there's no mass leaving the system.

我们不讨论,这是隐含条件，因为我们讨论的是孤立系统，因此系统没有物质流失。

麻省理工公开课 - 热力学与动力学课程节选

Because we don't really consider Western Literature to have an actual closed canon of authoritative texts.

因为我们并不认为西方文学,具有权威文本的固定标准。

耶鲁公开课 - 新约课程节选

"Now,we are always very curious about, 'What are they doing behind those closed doors,' you know,".

VOA: standard.2009.10.19

"The massive health care plans being crafted behind closed doors in Washington will ultimately allow the government to decide what doctors we can see, what treatments the government thinks you deserve, and what medicines you can receive,".

VOA: standard.2009.10.17

The real issue lies in how much attention and how much consistency and perseverance we put in strengthening democratic institutions The summit's mostly closed door sessions are taking up several thorny issues, among them a proposal to create an African Defense Council.

VOA: standard.2009.07.02