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.
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这是杜耀豪旅程的最低谷。至此，他彻底明白，自己无法也无须为上一代的创伤与恩怨负责。他的角色，不是法官，而是见证者。他对南方周末记者说：“在关系中，我们是他人生活的见证者。我喜欢这个观念，我们以某种方式互相关联，所以我也与他们的历史相关。”
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Dorsey also said the company’s customer base is expanding and profitability is improving, which he attributed to AI implementation.，更多细节参见91视频
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