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

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

But so many strategies are cost-effective today, and they require barrier-busting at every level.

FORBES: Richard Branson's Carbon War Room