"quantum tunnelling" meaning in English

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        "Any of several quantum mechanical effects in which a particle disobeys the laws of classical mechanics."
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        "(quantum mechanics) Any of several quantum mechanical effects in which a particle disobeys the laws of classical mechanics."
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        "Any of several quantum mechanical effects in which a particle disobeys the laws of classical mechanics."
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        "(quantum mechanics) Any of several quantum mechanical effects in which a particle disobeys the laws of classical mechanics."
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