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.
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另外，伙食费是按照天收取，如果没吃是可以退费的，我们这个园35元/天，提供三餐两点，每周会公布菜谱，这一个学期吃下来，孩子很满意，我看菜做的也不错。因为孩子有过敏的食物，所以在入园前填写资料时，就已经把过敏源填好了，园里的餐食会根据不同孩子过敏的食物，单独给做，所以给我的感觉园所还不错。