One reason for routinely launching GPS satellites is simply "constellation replenishment," said Col. Andrew Menschner, deputy commander of the Space Force's Space Systems Command. Old satellites degrade and die, and new ones need to go up and replace them. At least 24 GPS satellites are needed for global coverage, and having additional satellites in the fleet can improve navigation precision. Today, there are 31 GPS satellites in operational service, flying more than 12,000 miles (20,000 kilometers) above the Earth.
It's also a busy time for hospitals as they discharge as many patients as possible so they can be at home for Christmas.
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2002年10月，在浙江全省领导干部会议上，面对台下500多名干部热切的目光，刚履新的习近平同志郑重承诺：“做到‘一张蓝图绘到底，一任接着一任干’”“跑好‘接力赛’中自己的‘这一棒’”。
Фото: Mindaugas Kulbis / AP，这一点在一键获取谷歌浏览器下载中也有详细论述
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