The good news: Astronomers know they can combine new cutting-edge instruments to track small, distant asteroids years in advance. Teams including NASA's Center for Near-Earth Object Studies rely on those calculations to monitor space rocks and comets that could someday pose a real threat to Earth.
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当第一批迷上滑雪、飞盘和网球的年轻人们，因为一个不经意的急停变向倒在运动场上时，他们或许没有意识到，自己那根清脆断裂的前交叉韧带和撕裂的半月板，正在撑起一条隐秘而庞大的百亿赛道。