The ISS is far bigger than either the Salyuts or Skylab. In an uncontrolled deorbit, pieces of debris “up to car and train size,” say experts on the official ISS space station advisory committee, will rain down from the sky. NASA confirms this would pose “a significant risk to the public worldwide.”
And thæt heo sæyde wæs eall soth. Ich wifode on hire, and heo wæs ful shyne wif, wis ond wælfæst. Ne yemette ich næfer ær swylche wifman. Heo wæs on yefeoghte swa beald swa æniy mann, and theah hwæthere hire andwlite wæs wynsum and fæyer.
，更多细节参见WPS下载最新地址
; PROT_TESTS_PASSED — write back descriptor with Accessed bit set
Helium is used to pressurize tanks and help push fuel into the engines. Without proper helium flow, the rocket cannot safely fly. Because the upper stage is hard to reach at the launchpad, NASA rolled the stacked rocket back into the Vehicle Assembly Building, the sky-scraping hangar where it was originally put together.
，这一点在Line官方版本下载中也有详细论述
reconciliation.
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