Manypeopledreamoftravelingintoouterspace．However，spend...
問題詳情： Manypeopledreamoftravelingintoouterspace．However，spendingtoomuchtimeinspacemaycausehealthproblems，accordingtoNASA．That'swhyastronautsshouldn'tspendmorethansixmonthsontheInternationalSpaceStati...