求翻译：The water bag method of fly repellant has many supporters, from restaurant owners to backyard grill-masters. So how does the method drive flies away? Some insist the flies perceive the clear liquid as the surface of a body of water. Others claim the insect flys away at the sight of its own magnified reflection. But the most popular reasoning that pops up among entomologists and patent-filing entrepreneurs is simple light refraction.是什么意思？

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