特朗普周六在华盛顿特区主持了庆祝美国陆军成立 250 周年的阅兵式，成千上万的美国人涌向美国首都。庆祝活动包括陆军 Golden Knights Parachute ...

China successfully conducted an escape flight test on its new-generation manned spacecraft Mengzhou at zero altitude on ...

Mengzhou is a new generation of manned space-to-ground round-trip transport vehicle which is independently developed by China for the subsequent manned spaceflight missions. It adopts a modular design ...