Description
很多朋友平时都喜欢打羽毛球吧，你们有注意过羽毛球的羽毛数量吗？事实是，羽毛球的羽毛根数只有在对称时才能保持羽毛的平衡，当羽毛根数为2的平方数时是最对称的。而16根是保持羽毛间除最合适的根数，重量约为5G，能有效保证羽毛球的平稳飞行。其实，历史上也曾经也有过14根、15根羽毛做的羽毛球，但后来国际羽联统一了标准，现在都是一律用16根羽毛做的羽毛球了。
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