单词:gamma waves
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September Equinox 秋分 We have an equinox because an imaginary plane extending outward from Earth's equator isn't the same as the plane of Earth's orbit around the sun. Learn more about today's equinox -- on Earth and Sky.. JB: This is Earth and Sky
ANNOUNCER: EXPLORATIONS -- a program in Special English by the Voice of America. (MUSIC) Neil Armstrong with the X-15 Today, Doug Johnson and Frank Oliver tell about the first airplane that flew out of the Earth's atmosphere. It was designed to test
A new airplane may soon be able to travel into space at more than five times the speed of sound. The Defense Advanced Research Projects Agency, or DARPA, announced last Wednesday that a project by the aerospace company Boeing was making progress. DAR
Good afternoon everyone. I am Creshon Saunders at the CNN.com newsroom in Atlanta. Here is a look at whats happening NOW IN THE NEWS. Authorities say none of the five passengers aboard a small plane survived after it crashed into a residential area
9. Are there any discount tickets for me? 我买票有折扣吗? 还能这样说: Will you give me some discount on tickets? Any tickets on discount? 应用解析: cash discount 现金贴现; sample discount 打折扣样品; discount factor
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