单词：critical altitudes
【军事、航空学】临界高度
单词：critical altitudes 相关文章
Project Aims to Study Stratosphere Via Aerospace Firm's Glider A glider designed by Airbus Group successfully completed its maiden flight Wednesday ahead of next years attempt to reach the edge of the space. The ultimate goal is to study the stratosp
VOA标准英语2015年(九月)
Situation Critical 十万火急 by Kevin Lustig In some jobs, danger can appear at any moment. In the blink of an eye, the routine can become perilous. This month, the National Geographic Channel shows us what happens when a normal situation becomes
常春藤解析英语
空客新飞机挑战新高度 Gliders are like engineless aircraft that are towed by powered planes to a certain height. From there, they use natural updrafts, also called mountain waves, to soar to the sky. That is why their wings are so much longe
VOA标准英语2016年(一月)
In the Pacific state of Hawaii, U.S. President Barack Obama on Sunday told leaders of the 21 Asia Pacific Economic Cooperation economies that the region will be key to U.S. economic recovery. With much of the formal summit activity, including a worki
英语新闻
Cosmic Radiation 上世纪早期，科学家发现一种神秘的辐射形式会破坏他们的实验。后来奥地利物理学家Victor Hess研究发现辐射可能来自天空。后来他多次坐热气球用各种仪器（包括测量放射电荷的
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