Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00296-3
We're all familiar with the high-pitched squeak of basketball shoes on the court during games, or tires squealing on pavement. Scientists conducted several experiments and discovered that the geometry of the sneakers' tread patterns determines the squeak's frequency, enabling the team to make rubber blocks set to specific frequencies and slide them across glass surfaces to play Star Wars' "Imperial March."
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“有些人入仕数十年，终为名利所困，或一事无成，或身败名裂。究其原因，是没有树立正确的当官宗旨。”“当官，当共产党的‘官’，只有一个宗旨，就是造福于民。”，更多细节参见一键获取谷歌浏览器下载
* @param n 堆的大小