年度征文｜2025 年育儿手记：从家到幼儿园
There is a plan to prevent such a strike—the Space Surveillance Network, a bevy of sensors that the military uses to track space debris. NASA monitors what’s unofficially known as the “pizza box,” a sort of no-fly zone around the ISS. When pieces of debris are predicted to enter the box—if there’s at least a 1 in 100,000 chance of collision—mission controllers order avoidance maneuvers, firing thrusters that move the ISS and dodge the trash. The technique has been used dozens of times since the first ISS module launched in 1998. But the system only tracks about 45,000 larger pieces, and all sensors have noise. Plus, risk thresholds can miss stuff, sometimes badly. In 2025, Chinese astronauts were briefly stranded at their station after debris hit their return vehicle.，更多细节参见safew官方版本下载
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曾幾何時，我那本尺寸超大的柯林斯–羅伯特法語硬皮字典，在我學生宿舍的書架上佔據了最顯眼的位置。我擁有的是 1980 年代末期的版本，將近一千頁，它是從哥哥們那裡傳下來的。