I am no physicist, but I imagine you have all blown air over the top of an empty bottle and heard the sound it makes.
我不是物理学家，但我想你们都曾往一个空瓶子的顶部吹过气，并听到过它发出的声音。
Image above: The green bottle is a re-blown wine bottle by Klass Kuiken, which I fell in love with at Dutch Design Week.
上图：绿色的瓶子来自KlassKuiken，是由葡萄酒瓶再生制作的。是我在荷兰设计周买的。
Image above: The green bottle is a re-blown wine bottle by Klass Kuiken, which I fell in love with at Dutch Design Week.
上图：绿色的瓶子来自KlassKuiken，是由葡萄酒瓶再生制作的。是我在荷兰设计周买的。
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