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（二）明知住宿人员是犯罪嫌疑人员或者被公安机关通缉的人员，不向公安机关报告的；
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The story starts with quantum field theory, which is incredibly complex, but the simplified version is that even empty space is filled with fields that could govern the interactions of any quantum objects in or near that space. You can think of different particles as energetic excitements of these fields—so a photon is simply an energetic state of the quantum field.