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“轰隆隆……”伴随着一声巨响,美国空军X-37B无人太空战斗机发射升空啦!这是世界上第一架无人太空飞机,其功能和任务均被美军列为机密。
“Rumble ... ” With a loud noise, the United States Air Force X-37B unmanned space fighter launched it! This is the world’s first unmanned space aircraft, its functions and tasks are classified as the US military secrets .