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Long-duration missions in space take a toll on the body, astronauts lose bone density and suffer muscle loss. Blood circulation is also affected, and fluid shifts can also impact eyesight.
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这两位博导提到的“博士考核入学”，就是博士“申请-审核”制。早在2007年，复旦大学就在医学博士招生中进行了“申请—审核”制度的尝试，2008年，上海交通大学在博士生招生中拿出100个名额进行试点。2013年3月，教育部等部门联合发布《关于深化研究生教育改革的意见》，明确指出博士研究生选拔要逐步推行“申请-审核”制。到2014年，北京大学、清华大学、复旦大学、厦门大学、山东大学等七十余所院校试行这一制度。当前，“申请—审核”制已经在我国大部分高校的博士招生中实施。，更多细节参见搜狗输入法下载
"Space regulations don't cover the new problems emerging - interference with astronomical observations, risk of collision in orbit, risk of stuff falling on our heads, and now it is becoming clear, atmospheric pollution," says Andy Lawrence, Professor of Astronomy at the University of Edinburgh.