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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Deco failed to find space, and therefore the time to make precise passes, as Fletcher and Carrick's energy and intelligence formed a difficult barrier for Chelsea to pass.

德科没能找到空间和时间送出准确的传球。弗莱彻和卡里克的动力和智慧给切尔西的传球路线树起难以逾越的屏障。

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It can allow a particle to pass through a physical barrier that should be impenetrable, or can allow an electron to escape from the pull of the nucleus without having the kinetic energy to do so.

它能让粒子通过不可逾越的物理障碍，或让电子不用动能就脱离原子核的吸引力。

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And even pedestrians might have to pass through a customs barrier.

NPR: Border Rules May Alter Life on Canada-Vermont Line

Author David Boyle, of the New Economics Foundation, told BBC News that he was not suggesting that all children should be coached to pass entrance exams into "super-selective" schools, but that the need for coaching to pass some of the tests was "a clear barrier" to some families.

BBC: Education & Family