关注微信领¥50

百门课程¥0元


50万+已关注

科学美国人60秒:磁场或为候鸟导航-托福听力下载

2017-02-04 16:03:00来源:科学美国人60秒

点击查看>>科学美国人60秒音频:磁场或为候鸟导航

  科学美国人60秒中英文翻译:磁场或为候鸟导航

  科学美国人60秒英文文本

  If you're lost, you need a map and a compass.

  The map pinpoints where you are, and the compass orients you in the right direction.

  Migratory birds, on the other hand, cantraverse entire hemispheres and end up just a couple miles from where they bred last year, using their senses alone.

  Their compass is the Sun, the stars and the Earth's magnetic field.

  But their map is a little more mysterious.

  One theory goes that they use olfactory cues—how a place smells.

  Another is that they rely on their sense of magnetism.

  Researchers in Russia investigated the map issue in a past study by capturing Eurasian reed warblers on the Baltic Sea as they flew northeast towards their breeding grounds near Saint Petersburg.

  They moved the birds 600 miles east, near Moscow.

  And the birds just reoriented themselves to the northwest—correctly determining their new position.

  Now the same scientists have repeated that experiment—only this time, they didn't move the birds at all.

  They just put them in cages that simulated the magnetic field of Moscow, while still allowing the birds to experience the sun, stars and smells of the Baltic.

  Once again, the birds re-oriented themselves to the northwest

  suggesting that the magnetic field alone—regardless of smells or other cues, is enough to alter the birds' mental map.

  The study is in the journal Current Biology.

  And if you're envious of that sixth sense—keep in mind that since the Earth's magnetic field fluctuates, the researchers say magnetic route-finding is best for crude navigation.

  Meaning for door-to-door directions—you're still better off with your GPS.

  中文翻译请点击下一页

为你特别匹配的托福超值课程,快速提分先人一步!
  • 新东方托福1月公益课(第1期)

    新东方托福1月公益课(第1期)

    特点1天1节公益课,给2019来点托福备考新鲜货!

    课时:10小时

    查看详情
  • 【活动价】新东方托福名师在线一对一(体验课)

    【活动价】新东方托福名师在线一对一(体验课)

    适合人群:想体验新东方在线致赢托福1对1辅导冲分课程的同学

    体验课时:30分钟

    查看详情
  • 大学生旗舰直达班 (冲110分)

    【知心托福】大学生旗舰直达班 (冲110分)

    适合人群:托福目标分数110分!

    课时:343

    查看详情
  • 大学生旗舰直达班 (冲100分)

    【知心托福】大学生旗舰直达班 (冲110分)

    适合人群:托福目标分数100分!

    课时:331

    查看详情
  • 大学生旗舰直达班 (冲90分)

    【知心托福】大学生旗舰直达班 (冲90分)

    适合人群:托福目标分数90分!

    课时:310

    查看详情
全部课程>>
单项突破
直播课堂

更多托福课程
新东方25年教学经验沉淀
托福考生必修课
托福考生,高效提分,安心之选

查看详情>>
更多>>
更多课程>>
更多>>
更多内容
更多>>
更多公开课>>
更多>>
更多课程>>