... cislunar satellite 地球和月亮轨道间的卫星 civil aeronautics 民航学 civil air route 民航航线 ...
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目前，民航系统共有5所民用飞行学以及两所科研中心和11个科研基地，在校学员27,000名。
About 27, 000 students were enrolled among five civilian flight schools, two scientific-research centers and 11 scientific-research bases.
为了解民航客机垃圾的卫生学特点，探讨其无害化处理方法，就首都机场的有关问题进行了调查与研究。
To study the sanitary characteristics of airline aircraft garbage and the way of its treatment, an investigation was made in the Capital National Airport.
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