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荷兰人的城市河道，为什么要铺管子吹气泡？这能起到什么作用？
荷兰人简直太奇怪了，别人都害怕河道出现杂物，他们却往里面到处插管子，然后不断的吐气泡。荷兰人为什么要往河道插管子？吐气泡又能起到什么作用？
不可思议的科普50/71
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