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【2019•山东东营】What’saspacewalk?Anytimeanastronautgetsoutof...
问题详情:【2019•山东东营】What’saspacewalk?Anytimeanastronautgetsoutofaspacecraft(航天器)whileinspace,itiscalledaspacewalk.Astronautsgoonspacewalksformanyreasons.Forexample,experimentscanbeplacedonth...