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Noctilucent clouds were first observed in 1885 by an amateur astronomer.
1885年,一位业余天文学爱好者最早观察到夜光云.
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Rare earth noctilucent fibers are a kind of new materials, provided with special function.
稀土夜光纤维是一种具有特殊功能的新型材料.
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- so long int.再见;
- perspective-taking 观点采择;
- software n.(计算机)软件;
- punctual adj.准时的,守时的;
- celebrate v.庆祝;赞美;主持(圣餐或弥撒);
- truck n.货车;(铁路的)无盖货车;(行李)搬运车;vt.用卡车装运;
- hear v.听见;倾听;听说;审理;脑际响起;接到…的信/电话;
- Catholic adj.(罗马)天主教的;广泛的;n.天主教信徒;;
- you are 你是;你们是;
- AIDS abbr.acquired immune deficiency syndrome 获得性免疫缺乏综合征(艾滋病);acute infectious diseases 急性传染病;aircraft integrated data system 飞行器集成数据系统;n.助手( aid的名词复数 );外援;辅助设备;帮助;
- clap v.拍手,鼓掌;急速放置;轻拍;n.鼓掌,拍手(声);霹雳声;
- issue n.问题;(报刊)期号;发行;子嗣;v.发表,发布;供给;出版;将…诉诸法律;

