课程咨询

托福考试网 托福资料下载 托福资讯 0元讲座 水平测试

托福考试练习
新东方在线 > TOEFL > 托福听力 > 正文
托福培训

扫码免费领资料

内含托福全科备考资料

更有免费水平测试及备考规划

托福培训

扫码关注掌握一手留学资讯

回复XDF免费水平测试

录播精讲 直播课HOT

托福听力练习-科学美国人60秒:猫头鹰的奥秘

2017-02-18 17:33:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：猫头鹰的奥秘

　　科学美国人60秒中英文翻译：猫头鹰的奥秘

　　科学美国人60秒英文文本

　　Owls are nearly noiseless hunters, swooping down on prey without any warning whoosh.

　　How do they do it?

　　We’ve known that the leading edge of an owl's wing has a comb of stiff feathers.

　　And the trailing edge has a flexible fringe, unlike the rigid trailing edge of a conventional bird wing.

　　These two features contribute to a structure that produces almost no noise as it rushes through the air.

　　Now it appears that these predators have a third trick up their sleeves—or rather, wings—that allow them to be so silent but deadly.

　　Researchers modeled the effect of the layer of down on the wing’s top surface.

　　And it looks like that fluffy stuff absorbs sound too.

　　The work was presented at a meeting of the American Physical Society's Division of Fluid Dynamics.

　　Mimicking owl wing down may lead to new sound-proofing materials.

　　Down and the other silencing features could inspire wind turbines and plane engines that produce less noise and fewer vibrations.

　　So that all we hear is silence.

　　中文翻译请点击下一页

本文关键字: 托福听力练习 科学美国人60秒

上一页 1 2 下一页

托福辅导

关注新东方在线托福

托福机经·Official题目练习

考前重点突破·听说读写海量资料

更多资料

关注新东方在线托福，
回复【XDF】获取大礼包

托福辅导
  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加】，回复对应关键字领取学习资料。
更多>>
更多内容

免费获取托福备考大礼包

微信扫描下方二维码 立即领取

托福辅导
更多>>
更多公益讲座>>
更多>>
更多资料
托福TPO 托福听力练习 托福口语练习 托福阅读练习 托福写作练习
我要
反馈 返回
首页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10