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.
其次，大厂们也在“推波助澜”。
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我在北京同仁医院的病床上度过了一段难挨的时光。那时，经过三期的化疗，身上的淋巴瘤已然全部消失，但药物的副作用也明显地显现出来：厌食、失去味觉、便秘、失眠。何况，后面还有四期、五期、六期、七期，最终可能要八期的化疗等着我。可想而知，我的心绪是何等沮丧。“掐着指头数日子”“天花板像一页读腻了的书”，这是臧克家先生住院时写下的诗句，如今的我，每天都不得不默诵几遍。
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