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在大多数看不见的地方，能够同时具备以上三条的银发人群，实则是少数。
，详情可参考91视频
Source: Computational Materials Science, Volume 267，详情可参考safew官方版本下载
The people of the world saw their planet as the astronauts saw it - fragile and beautiful, shining in the desolation of space.
If they have time, astronauts and cosmonauts will look to plug the leak or close the hatch to the leaking section of the station. (That is how they dealt with a minor leak in the station’s PrK module for a number of years, and it basically worked.) Remember, though, that this is the worst-case scenario, and our crew will run into a hard deadline. Once pressure falls to around 490 mm Hg, NASA says, critical systems risk breaking down. Astronauts could suffer hypoxia, oxygen deprivation so debilitating they could become delirious. It will be a heart-wrenching call, but if nothing else can be done, the crew will need to go to their crew vehicles and leave the ISS.