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n.宇宙航行学（cosmonautic的复数）
1、these landmark events, the evolution of national cosmonautics entered the history of mankind.───这些标志性的事件将国家航天技术的进展载入了人类的史册。
2、With these landmark events, the evolution of national cosmonautics entered the history of mankind.───这些标志性的事件将国家航天技术的进展载入了人类的史册。
3、national space program has always envisaged cosmonautics as being used not only in the interests of our country but in those of all mankind.───一直以来，我国的空间计划都有一个设想：航天科技不仅用来为我们自己的国家牟取利益，而是为了造福全人类。
1、The national space program has always envisaged cosmonautics as being used not only in the interests of our country, but in those of all mankind.
2、Our school was near to the Cosmonautics Center that we even can hear the countdown shouting.
3、FMEA, a popular precaution, firstly applied in the field of cosmonautics, then widely applied in industrial production, has made a great success.
4、With these landmark events, the evolution of national cosmonautics entered the history of mankind.