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文章来源:admin    时间:2019-08-05

  Sixty-seven red-crowned cranes were hatched this year in Zhalong National Nature Reserve, the world's largest captive breeding center for the endangered bird species, in northeast China's Heilongjiang Province.   今年已有67只丹顶鹤在黑龙江扎龙国家自然保护区孵化,该保护区是世界上最大的濒危鸟类人工繁育中心。
    Around 1,000 red-crowned cranes have been artificially bred in the Zhalong reserve, set up in 1979 and covering an area of 2,100 square kilometers in China's largest reed wetland.   The reserve has been exploring ways to train the captive-bred cranes for release into the wild to raise the crane population with a healthy genetic1 pedigree. More than 300 cranes have been released and the population of red-crowned cranes in the reserve currently stands at around 500.   The reserve started to place ring marks on the birds' legs to avoid inbreeding in 2002 and has diverted 2.9 billion cubic meters of water from nearby rivers to prevent wetland degradation2.   Red-crowned cranes are usually found in northeast China, Russia, Japan, South Korea and the Democratic People's Republic of Korea. There are around 2,400 red-crowned cranes living in the wild worldwide.
1 genetic      adj.遗传的,遗传学的 参考例句:
  • It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
  • Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
2 degradation      n.降级;低落;退化;陵削;降解;衰变 参考例句:
  • There are serious problems of land degradation in some arid zones.在一些干旱地带存在严重的土地退化问题。
  • Gambling is always coupled with degradation.赌博总是与堕落相联系。

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