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文章来源:admin    时间:2019-11-06

  China has successfully tested the technology that can accurately1 control the landing site of falling rocket parts, China Aerospace2 Science and Technology Corporation (CASC) said on Sunday.   中国航天科技集团公司周天宣布,中国已成功试验脱落火箭零件着陆位置的精准控制。   The CASC said that the test was carried out following a Long March-2C rocket launched on Friday, and focused on grid3 fins4 which are like "wings" on rocket core part to increase precision in control of its landing location.   According to experts from the CASC, the rocket' flight trajectory5 is designed to avoid densely6 populated areas. But after completing the mission, the rocket debris7 falls under no control with a wide range of landing points which sometimes involve inhabited areas.   In order to ensure the safety of people's lives and property, the currently practice is to evacuate8 people to the safety zone before each mission, which is not only inconvenient9 for the local people, but increases the cost and task difficulty.   The success of the test is of great significance for improving China's inland rocket landing safety, minimizing the inconvenience to the local people, as well as promoting the follow-up development of carrier rockets' controllable recovery, soft landing and reuse, according to He Wei, an official with the CASC.   "The swinging grid fins were used to control the rocket debris' direction and attitude, much like the wings of the debris," said Cui Zhaoyun, the deputy chief designer of Long March-2C rocket. The landing site control of large and medium rockets is much more difficult than that of small rockets, he added.
1 accurately      adv.准确地,精确地 参考凯发k8娱乐官网例句:
  • It is hard to hit the ball accurately.准确地击中球很难。
  • Now scientists can forecast the weather accurately.现在科学家们能准确地预报天气。
2 aerospace      adj.航空的,宇宙航行的 参考例句:
  • The world's entire aerospace industry is feeling the chill winds of recession.全世界的航空航天工业都感受到了经济衰退的寒意。
  • Edward Murphy was an aerospace engineer for the US Army.爱德华·墨菲是一名美军的航宇工程师。
3 grid      n.高压输电线路网;地图坐标方格;格栅 参考例句:
  • In this application,the carrier is used to encapsulate the grid.在这种情况下,要用载体把格栅密封起来。
  • Modern gauges consist of metal foil in the form of a grid.现代应变仪则由网格形式的金属片组成。
4 fins      [医]散热片;鱼鳍;飞边;鸭掌 参考例句:
  • The level of TNF-α positively correlated with BMI,FPG,HbA1C,TG,FINS and IRI,but not with SBP and DBP. TNF-α水平与BMI、FPG、HbA1C、TG、FINS和IRI呈显著正相关,与SBP、DBP无相关。 来自互联网
  • Fins are a feature specific to fish. 鱼鳍是鱼类特有的特征。 来自辞典例句
5 trajectory      n.弹道,轨道 参考例句:
  • It is not difficult to sketch the subsequent trajectory.很容易描绘出它们最终的轨迹。
  • The path followed by a projectile is called its trajectory.抛物体所循的路径称为它的轨道。
6 densely      ad.密集地;浓厚地 参考例句:
  • A grove of trees shadowed the house densely. 树丛把这幢房子遮蔽得很密实。
  • We passed through miles of densely wooded country. 我们穿过好几英里茂密的林地。
7 debris      n.瓦砾堆,废墟,碎片 参考例句:
  • After the bombing there was a lot of debris everywhere.轰炸之后到处瓦砾成堆。
  • Bacteria sticks to food debris in the teeth,causing decay.细菌附着在牙缝中的食物残渣上,导致蛀牙。
8 evacuate      v.遣送;搬空;抽出;排泄;大(小)便 参考例句:
  • We must evacuate those soldiers at once!我们必须立即撤出这些士兵!
  • They were planning to evacuate the seventy American officials still in the country.他们正计划转移仍滞留在该国的70名美国官员。
9 inconvenient      adj.不方便的,令人感到麻烦的 参考例句:
  • You have come at a very inconvenient time.你来得最不适时。
  • Will it be inconvenient for him to attend that meeting?他参加那次会议会不方便吗?

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