// 易错点2：用Math.ceil/Math.floor取整 → 破坏时间比较逻辑，必须精确计算
DENVER—The Global Positioning System is one of the few space programs that touches nearly every human life, and the stewards of the satellite navigation network are eager to populate the fleet with the latest and greatest spacecraft.。业内人士推荐谷歌浏览器【最新下载地址】作为进阶阅读
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def __str__(self):，推荐阅读夫子获取更多信息
输出：[3,1,2,1,1,0]