Officials at Elon Musk's company said the upper stage was lost after problems developed after lift-off from Texas on Thursday.
For this story, WIRED reviewed dozens of NASA documents, including backup plans and contingencies for emergencies, and spoke to more than a dozen people, including three astronauts who’ve visited the ISS, and no one seemed that freaked out. One astronaut said the most worrisome scenario that actively crossed his mind in orbit was getting a toothache. The ISS has had some emergencies, including a first-ever medical evacuation in January, but generally things have been remarkably stable. In fact, one of the most impressive things about the ISS is that nothing very dramatic has ever happened to it. No experiment has gone too haywire. It hasn’t been hit by an asteroid.。关于这个话题，WPS下载最新地址提供了深入分析
Include test results (accuracy on random pairs)，这一点在同城约会中也有详细论述
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