* @param arr 数组
High-speed imaging reveals that the squeak of soft–rigid frictional interfaces, like sneakers sliding on a basketball court, arises from intersonic opening slip pulses—analogous to earthquake ruptures—that thin ridges on the rubber confine to repeat at a musical frequency.，推荐阅读safew官方版本下载获取更多信息
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Sometimes the funniest part of Pokémon is what it refuses to explain.