久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

您現在的位置: > Language Tips > Audio & Video > Normal Speed News  
 





 
Space shuttle Discovery lands safely in Florida
[ 2006-07-19 09:19 ]

The U.S. space shuttle Discovery has landed in Florida, ending a resupply and maintenance mission to the International Space Station. Its successful flight means the space agency NASA can finally resume construction of the station.

Discovery's safe landing is an obvious relief to NASA, which was forced to halt assembly of the half-built space station more than three years ago when the shuttle Columbia disintegrated upon re-entry into the atmosphere.

Discovery, sounding like any other airplane, glided smoothly onto a runway at the Kennedy Space Center in Florida.

After landing, shuttle commander Steve Lindsey inspected the spacecraft and declared it free of damage, after its nearly nine million-kilometer journey.

"This is my fourth flight, and I've done four walk-arounds, and I've never seen a vehicle that looked as clean as this one did," said Steve Lindsey.

That is important to NASA, because it worked more than three years to ensure that shuttles suffer as little damage as possible from the kind of launch debris that doomed Columbia. That orbiter burned up when searing atmospheric gases entered a hole in its wing, caused by hard foam insulation that broke away from the external fuel tank during liftoff and hit it.

As a result, NASA removed or reshaped several areas of tank foam, installed an array of ground cameras to monitor launches, and put new cameras and sensors on shuttles to detect possible launch debris strikes or hits by micro-meteoroids while in orbit.

NASA chief Michael Griffin attributes Discovery's near-pristine condition to these new measures and a bit of luck.

"This is as good a mission as we've ever flown, but we're not going to get overconfident," said Michael Griffin. "We have to take it flight by flight."

During Discovery's two-week flight, two spacewalking astronauts tested new procedures to make repairs in orbit to the shuttle's fragile heat shield. The orbiter also transported a third crew member to the space station, which had only two since Columbia's accident. Station manager Mike Suffredini says it also hauled up new supplies and equipment, and its crewmembers made repairs to station systems critical to resuming the outpost's construction.

"So with this flight, in our minds, we are ready to get on with assembly, and we will do just that," noted Mike Suffredini.

Station assembly restarts late next month, when the shuttle Atlantis is to deliver a pair of solar energy panels, new batteries and a truss segment on which to mount other components.

NASA chief Griffin points out that shuttle flights are always risky and that station assembly missions are the most complicated that shuttles fly. He says only 16 shuttle flights remain before the fleet is retired in 2010, and more orbiter troubles could be ruinous for the space station's construction schedule.

"We don't have any slack [leeway]," he said. "We have just enough shuttle flights left to do the job. So, we can't afford to mess up."

Griffin thanked America's international partners in the space station program for their patience and support, while NASA took time to make shuttles safer to fly.

Vocabulary:         

orbiter :宇宙飛船

ruinous :detructive(毀滅性的)


(來源:VOA  英語點津姍姍編輯


 

 
 

 

 

 
 

48小時內最熱門

     

本頻道最新推薦

     
  Do-it-yourself: Growing carrots
  EU fines Microsoft again
  G8 summit adopts sweeping action Plan
  Young people are subject of World Population Day
  Lebanese seek shelter wherever they can find it






主站蜘蛛池模板: 国产男女爽爽爽免费视频 | 国产在线a不卡免费视频 | 九九在线免费视频 | 日本性色 | 欧美极品在线播放 | 91国内精品久久久久怡红院 | 性午夜| 国产一级做a爰片... | 久久免费视频网 | 国产天堂在线一区二区三区 | 日韩一级黄色毛片 | 国产精品日韩欧美一区二区三区 | 国产精品成人免费 | 中文字幕在线视频网站 | 国产亚洲综合在线 | 韩国一级黄色大片 | 亚洲欧美久久精品 | 日韩三级欧美 | 国产区精品一区二区不卡中文 | 国产男人天堂 | 自拍偷拍欧美视频 | 视频一区在线观看 | 妖精www成人动漫在线观看 | 2021国产精品自在拍在线播放 | 国产精品久久国产精品99 | 九九国产在线 | 久久久999国产精品 久久久99精品免费观看 | 国产亚洲精品一区二区在线观看 | 成人欧美一区二区三区黑人免费 | 国产精品亚洲专区在线播放 | 成人免费视频在线 | 偷看各类wc女厕嘘在线观看 | 毛片激情永久免费 | 精品国产免费人成高清 | 草久在线观看视频 | 亚洲国产剧情在线精品视 | 一级毛片免费不卡在线 | 免费国产不卡午夜福在线观看 | 男人天堂网在线视频 | 亚洲精品高清在线 | 免费观看成年的网站 |