Quantum tunneling is an effect where a particle can pass through a barrier it would not normally have the energy to overcome.

量子隧穿效应是指粒子能够穿过正常来说它的能量不足以通过的障碍。

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IBM\'s Hamilton says virtual worlds actually make employees want to start working relationships with one another, adding, "Geography doesn\'t seem to be the barrier it once was.

IBM的Hailton说：虚拟世界使员工很好的联系在一起，而地理环境的差异也不再是一种障碍。

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It is the greatest barrier to building a farm of their own.

这是他们建立自己的农场所面临的最大障碍。

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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

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

It's at equilibrium, under the new condition, that is with the barrier removed.

系统在新的状态下处于平衡，这个新的状态就是指隔板被取走了。

麻省理工公开课 - 热力学与动力学课程节选

The very difficulty in overcoming this barrier makes it hard for those who have gained entry to leave.

ECONOMIST: Theoretical physics

We want to knock down the language barrier wherever it trips people up, and we can't wait to see what the next six years will bring.

CNN: Bonjour Google! Gmail adds auto-translation

For law firms in particular, outdated perceptions for years remained a serious psychological and self-serving business barrier when it came to advising their clients whether to outsource legal services.

FORBES: Legal Services Outsourcing (LSO) -- Maximizing Comparative Advantage