求翻译：There are plenty of people who don't think water bags can repel flies. Critics often classify this theory in the realm of old wives' tales and modern superstition. They chalk success stories up to confusion between correlation and causation. So do bags of water lower the number of houseflies around homes and restaurants? There are reasonable explanations that argue yes and significant evidence that proves no. Regardless, you can still find water bags hanging near restaurant patios and backyard porches across the globe.是什么意思？

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