Spaceisadangerousplace,notonlybecauseofmeteors(流星)butal...
10-09
问题详情:Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofraysfromthesunandotherstars.Theatmosphereagainactsasourprotectiveblanketonearth.Lightgetsthrough,andthisisnecessaryforplants...