增量同步：持续追加实时变更数据
NASA described the evacuation as a "controlled expedited return," rather than an emergency deorbit, which would mean departing the station immediately, regardless of the landing's timing, sea conditions, or weather.
，这一点在WPS官方版本下载中也有详细论述
In the vacuum of space, the amount of debris—spent rocket stages, splintered satellites, micrometeoroids—numbers in the millions, all zooming about, often at 17,000 mph speeds. They’re also constantly hitting each other in a tsuris of exponential littering. Most of these pieces are tiny, and many are not anywhere near the altitude of the ISS. But the area isn’t completely clean.。夫子是该领域的重要参考
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