There is no fence. They come across this barrier, right up here.

VOA: standard.2010.06.07

So, clearly, if we remove this barrier mixing takes place and obviously you know that that happens from lots of experience.

所以很明显，如果我们拿走隔板,气体混合就会发生,我们从大量的实际经验中就可以知道这些。

麻省理工公开课 - 热力学与动力学课程节选

This cell can only be an effective barrier if there's no way to get past it.

这些细胞只有密不透风,才足以形成一道屏障

耶鲁公开课 - 生物医学工程探索课程节选

U.S.Army officers say a language barrier impedes American efforts to impart this vital lesson.

VOA: standard.2009.12.13

This isn't scuba diving now off the Great Barrier Reef, or something like that.

不是现在大堡礁海岸边的潜水运动,或者其他类似的活动

耶鲁公开课 - 欧洲文明课程节选

Making this life change is hard on all fishermen, but for the Vietnamese and Cambodians here, the language barrier is an added obstacle in trying to reach out to BP for work and compensation.

VOA: standard.2010.05.15

The other is that this kind of adherence gives the tissue a property that's useful, in this case the property is it can serve as a barrier to nutrients from entering our body.

另外这种黏附,给予组织一种非常有用的属性,这种属性表现为组织成为,营养物质进入身体过程中的屏障

耶鲁公开课 - 生物医学工程探索课程节选

This part of the Illinois River near Morris is several miles southwest of the electronic fish barrier, a critical point along the Illinois waterway system meant to stop the Asian Carp from reaching Lake Michigan.

VOA: standard.2010.07.19