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1 при длительных космических полетах
Adaptation is of special importance in solving problems of the effect of isolation and monotonous surroundings on man during extended space flights…However, in long-term space flights certain deviations from the Earth's atmosphere may occur.Русско-английский словарь по космонавтике > при длительных космических полетах
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2 возникать
[син. иметь место; появляться; происходить]In the course of descent of the reentry compartment through the atmosphere a heavy incandescent shock wave is formed in front of it.However, in long-term space flights certain deviations from the Earth's atmosphere may occur. -
3 поэтому
[син. в результате; вследствие; следовательно; таким образом]Direct observations from space will help to solve a number of other scientific and economic problems. Thus space cities will have scientific laboratories……and for this reason the use of single-gas cabin atmospheres is not permissible in long-term flights.The external lines of spacecraft are far from being aerodynamically perfect; therefore, their lift/drag ratio is about 0.5 or less.
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