他们所学的知识帮助他们在1903年完成了第一次飞机飞行。
What they learnt helped them make the first airplane flight in 1903.
俄罗斯将庆祝人类首航太空50周年，苏维埃宇航员尤里加加林完成第一次太空飞行任务。
Russia has been celebrating the 50th anniversary of the first human space flight when the Soviet cosmonaut Yuri Gagarin completed a single orbit of Earth.
研究人员说单翼旋转飞行器并不是个新生概念，它的第一次是在1952年由在普拉西德湖边的查尔斯麦克琴完成飞行。
The researchers noted that the concept of a single-wing rotating aircraft is not new, with the first such vehicle being flown in 1952 by Charles McCutchen near Lake Placid, New York.
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