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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If used in combination with other antimicrobial agents, monolaurin can present an effective barrier to microorganisms.

如果与其他抗菌剂联用，月桂酸甘油酯可对微生物造成有效屏障。

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As an economical and effective method, the expressway noise barrier is a primary measure to reduce traffic noise.

高速公路隔声屏障作为一种经济有效的方法，是降低交通噪声的主要措施。

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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