NASA astronaut who had medical problem in space breaks silence
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Debris actually pelts the ISS all the time, and noticeable dents and cracks line the exteriors. But should something fully breach the station, cabin atmosphere will seep into the vacuum of space and alarms will go off. Pressure gauges will confirm to astronauts that the station has, almost certainly, been hit, and the speed of the seepages may indicate how much time the crew has to respond. According to one NASA estimate, a 0.6-centimeter-wide hole leaves 14 hours to plug the leak. A 20-centimeter hole leaves less than a minute.。业内人士推荐heLLoword翻译官方下载作为进阶阅读
The history of most human gestures is never written down, precisely because it is something we learn before literacy or memory and thus something we take entirely for granted.