NASA's decision to bring the crew home one month early, on Jan. 15, marked the agency's first controlled medical evacuation from the station in its 25 years of continuous operations. The incident highlighted the limits of treating complex health problems 250 miles away from Earth.
In total there are 10 separate investigations – or modules as they are called. So far only two, looking at pandemic preparedness and government decision-making, have been completed.。关于这个话题，一键获取谷歌浏览器下载提供了深入分析
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self.seen_urls = set()，这一点在快连下载安装中也有详细论述
Александра Синицына (Ночной линейный редактор)