Poincaré disk model. Take the open unit ball \(\mathbb{D}^n = \{x\in\mathbb{R}^n \mid \|x\|
可能需要投放多枚彈藥，才能確保深入地下和擊中目標。
。safew官方版本下载对此有专业解读
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And no matter what, the plan to use Russian assets remains problematic, since the ISS would have a “shallower reentry,” NASA says, and sprinkle surviving debris over a larger-than-desired area. Still, NASA would retain significant control over where any of these extant shards might plop down. They’ll probably land in the ocean, just as the space agency has always hoped. Sure, the station would have died before its time, but the thing was getting old. Most likely, it will be fine.
design awards over their years, and they were really very handsome machines.