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

这个细胞只有在无法通过时才能成为有效的屏障。

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The cells become more like ordinary skin, a much more effective barrier to infections.

这种细胞变得像是普通的皮肤，可以更有效的抵抗感染。

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The relationship between transmission coefficient and effective barrier height increasing is also discussed.

文中讨论了透射系数与有效势垒高度提高的关系。

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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

There are two ways the forces could function as a military deterrent: either (1) the U.S. deployment would be large enough to serve as an effective military barrier to a future Syrian military offensive or (2) the U.S. deployment would serve as a "tripwire" to ensure that such a Syrian offensive would trigger a large American military intervention to oppose it.

CENTERFORSECURITYPOLICY: Center for Security Policy | What hazards along the road to Damascus? Mission impossible

He said although the barrier had proved an effective defence, a tidal barrier was needed further downstream.

BBC: Thames Barrier engineer says second defence needed

Representatives from Caerphilly County Council told the committee that the lack of secure funding year on year is the main barrier to effective delivery of biodiversity action.

BBC: Sustainability committee