it is worth optimising.
因为移动互联网的原生一代，根本不会在意当年的争论，他们只会质疑：为什么自己面前这块巨大的屏幕，不能用手触摸？
。Line官方版本下载对此有专业解读
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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