新东方在线网络课堂 托福 新东方在线 > 托福 > 托福精选 > 正文

科学美国人60秒:人类是超级捕食者-托福听力下载

2016-11-18 15:52:43 来源:网络托福资料下载

点击查看>>科学美国人60秒音频:人类是景观恐惧中的超级捕食者

  科学美国人60秒中英文翻译:人类是景观恐惧中的超级捕食者

  科学美国人60秒英文文本

  This is Scientific American — 60-Second Science. I'm Jason Goldman.

  Small carnivores—like foxes or raccoons or badgers—are themselves prey for larger predators—like wolves. So they spend time hiding instead of hunting. This influence that big predators have on their ecosystem is called a "landscape of fear." But humans are wiping out most of the world's big predators. Which you might assume is good news for the small ones.

  But some researchers think that humans exert our own landscape of fear. Those foxes, raccoons and badgers just keep on hiding—only now, they're hiding from us. In reality, the situation may be far worse.

  "Humans kill these smaller carnivores, so things like raccoons and foxes that we have here in North America, European badgers that they have in the U.K. and elsewhere in Europe, and we kill them at a rate that's four times greater than their conventional large carnivore predators..."

  Liana Zanette of Western University in London, Ontario.

  "Because our killing of these smaller carnivores is kind of off the scale, we're considered the superpredator."

  獾.jpg

  To see how humans have altered the landscape of fear, Zanette and her team traveled to a small forest that's home to lots of European badgers near Oxford in the U.K. They used hidden speakers to broadcast the sounds of bears and wolves—two historic predators, both of which are no longer a threat. They also played the sounds of sheep, dogs and people. Hidden cameras recorded the badgers' willingness to look for food outside of their burrows as those sounds were played.

  They discovered that the badgers have retained some of their fear of bear sounds, and know that dogs still pose a threat. But they've lost their fear of wolves.

  "They treated the wolf calls just like the sheep calls."

  Despite their fear of bears and dogs, the badgers still eventually went out to eat amid their sounds. But when they heard people "they would not emerge from their burrows at all until the human sounds were completely off. So they would cower in their burrows for the two hours that the sounds were on, waiting for those human sounds to go off."

  In other words, they were leery of bears but were downright terrified of us. The findings are in the journal Behavioral Ecology.

  "The badgers recognize who their enemies are...they have recognized humans as their principle threat."

  Thanks for listening for Scientific American — 60-Second Science Science. I'm Jason Goldman.

  中文翻译请点击下一页

本文关键字: 科学美国人60秒 科学60秒下载 托福听力

为你特别匹配的托福超值课程,快速提分先人一步!
  • 大学生旗舰直达冲100分

    【知心托福】大学生旗舰直达冲100分

    适合人群:托福目标分数100!!!

    课程特色:推送补充相应知识点,有效提升学习效率。

    查看详情
  • 【知心托福】大学生旗舰直达冲90分

    【知心托福】大学生旗舰直达冲90分

    适合人群:托福目标分数90!!!

    课程特色:推送补充相应知识点,有效提升学习效率。

    查看详情
  • 【21天冲分】 21天直冲托福100+

    【21天冲分】 托福2018年6月临考急训25人班

    适合人群:参加过托福考试或基础段的学习,距离最新考试仅剩1个月时间,急需短期内快速高效冲分的考生。

    特点:全科直播24小时

    查看详情
  • TOEFL6月早练团

    【早练团】TOEFL6月早练团

    课程特色:高能学习的正确打开方式,早练早提分!

    课时:28课时(每天0.5小时,5月共上课28天)

    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

课程试听换一换

  • 知心托福 大学生旗舰直达班 (冲110分)

    ¥8280

  • 知心托福 直达班(冲110分)

    ¥4380

  • 知心托福 精品直达班(冲110分)

    ¥5880

  • 知心托福 大学生旗舰直达班 (冲100分)

    ¥7980

  • TOEFL 6月早练团-单日“听力团”+双日...

    ¥28

  • 知心托福 直达班(冲100分)

    ¥4080

  • 知心托福 中学生旗舰直达班 (冲110分)

    ¥8280

  • 知心托福 直达班(冲90分)

    ¥3880

分享到:

相关推荐

交流 • 下载

精品课限量免费领

  • 托福听力备考全攻略
  • 托福考试指南_托福新生必修课
  • 新东方雅思托福GRE词汇量在线测试

提分历程更多>>

实用 • 工具

托福课程排行榜本周本月

托福公开课更多>>

新东方在线知心托福介绍说明【热】 w 04分14秒
1 新东方在线知心托福介绍说明【热】
新东方在线唐悦宁:托福词汇遗忘规律 w 07分34秒
2 新东方在线唐悦宁:托福词汇遗忘规律
新东方在线唐悦宁:词根词缀记忆法 w 04分42秒
3 新东方在线唐悦宁:词根词缀记忆法
新东方在线唐悦宁:托福听力基础预备 w 03分30秒
4 新东方在线唐悦宁:托福听力基础预备
新东方在线李镇江:托福听力场景概述-社会科学-美国历史 w 08分35秒
5 新东方在线李镇江:托福听力场景概述-社会科学-美国历史

推荐阅读