Farmers rarely planted trees or tall crops around the buildings, so there would be no barrier to the airflow.

VOA: special.2009.09.08

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 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

"We are always trying to lower the barrier to entry for nonprofits.

VOA: special.2010.09.22

And yet, their subconscious mind limited them, prevented them from breaking that barrier that happened to be not a physical barrier as doctors, physiologists and scientists had claimed.

然而他们的潜意识限制了他们，阻止他们突破界限,那不是医生，生理学家和科学家们声称的身体界限。

哈佛公开课 - 幸福课课程节选

However,rights groups and exiled politicians say the detention of Aung San Suu Kyi, along with more than 2,000 other political prisoners, is the real barrier to peace.

VOA: standard.2009.06.19

The problem it solves for the cell is how to do I make a barrier around myself to define what's in me and what's outside of me when most of what's around me and what's in me is water.

它为细胞解决的问题是,当我体外和体内大部分都是水情况下,我怎样在自己周围设置一个界线,来区分什么是体内的,什么是体外的

耶鲁公开课 - 生物医学工程探索课程节选

"Our aspect of the project is to harvest the Asian Carp before they get to the fish barrier to reduce the numbers so there is less chance of any Asian Carp getting past the barrier."

VOA: standard.2010.07.19

These junctions, these red dots here are actually made up of proteins, some are synthesized by one cell, some are synthesized by each other, and they lock together to form a very tight barrier, to form a tight junction between the two cells.

这些红点表示细胞连接,实际上是由蛋白质构成的,有些是由一个细胞单独生成的,有些是由两个细胞共同生成,使这两个细胞紧锁在一起形成紧密的屏障,并在两细胞间形成紧密连接

耶鲁公开课 - 生物医学工程探索课程节选

But with threats, a language barrier and fear of the legal system, victims are often unwilling or unable to seek help.

VOA: special.2010.06.14

And,he was proud of being the first African-American to break the color barrier in a major opera house.

VOA: special.2010.03.07

The aim should be to aggressively create what he calls a "protective barrier" against loneliness.

VOA: special.2010.01.06

The underwater barrier is meant to shock the carp into turning back.

VOA: special.2009.12.15

The barrier,however, may not be enough to protect the Great Lakes.

VOA: special.2009.12.15

But in the absence of any service, we have found that it is able to remove that barrier in some cases."

VOA: standard.2010.06.14

"Every fish we take out there is one less fish to challenge the electric barrier further upstream yet."

VOA: standard.2010.07.19

But with threats, a language barrier and fear of the legal system, victims often do not or are unable to seek help.

VOA: standard.2010.05.24

Federal health minister,Nicola Roxon, says forcing the vessel to cancel a planned 10-day trip around the Great Barrier Reef is a necessary precaution.

VOA: standard.2009.05.30

In the early 1980s Ronald McNair helped to lift the racial barrier at NASA's astronaut program.

VOA: standard.2010.02.02

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

VOA: standard.2009.12.13

But the Illinois Department of Natural Resources is confident their containment measures are working, as they have yet to find more Asian carp above the electric barrier.

VOA: standard.2010.07.20

The minimum wage is relatively high compared to the wage in France so it's a barrier when you don't have any qualifications and when you start your career."

VOA: standard.2009.11.12

The fish that,for one reason or another, that found their way past the barrier, we suppressed them and try to take them out of the system to keep them from establishing in Lake Michigan."

VOA: standard.2010.07.20

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

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

"And their struggle and barrier is having an adequate health workforce and facilities for the kind of high-tech things that happen to mothers that are at risk " In contrast,Boufford says developed nations have excellent medical technology.

VOA: standard.2010.06.23