句间停顿:
  • 1S
  • 3S
  • 5S
语速: x 1.0
  • 速度0.8X
  • 速度1.0X
  • 速度1.2X
  • 速度1.5X
  • 速度1.8X
  • 速度2X
始终显示原文
欢迎使用 KMF 精听精研
坚持练习精听,反复听、吃透每个句子,能够快速 提升听力能力
开始精听
或按 「 空格」开始播放

段落1

This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

点击显示原文

隐藏原文=

Starting about 12,000 years ago, many species of North American animals began to die out.

点击显示原文

隐藏原文=

The episode is called the late Pleistocene extinction.

点击显示原文

隐藏原文=

And it killed off four of the six kinds of American big cats.

点击显示原文

隐藏原文=

Only cougars and jaguars survived.

点击显示原文

隐藏原文=

Now researchers say the other felines' diets may have been their doom.

点击显示原文

隐藏原文=

The clues are found on fossil teeth.

点击显示原文

隐藏原文=

Gnawing on brittle bones, for example, leaves different marks than chewing tender meat.

点击显示原文

隐藏原文=

So researchers compared the teeth of cougars to those of American lions and saber-toothed cats that did not make it.

点击显示原文

隐藏原文=

For context, they also analyzed the marks on the teeth of modern carnivores with known diets, including cougars, lions and hyenas.

点击显示原文

隐藏原文=

The study is in the journal Biology Letters.

点击显示原文

隐藏原文=

During tough times, both ancient and modern cougars consumed almost all of their prey, including the bones.

点击显示原文

隐藏原文=

But the cats that went extinct stayed picky, eschewing rather than chewing some body parts even when food was scarce.

点击显示原文

隐藏原文=

So next time you're faced with finicky eaters, tell them why there are no more saber-toothed cats.

点击显示原文

隐藏原文=

Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

点击显示原文

隐藏原文=
[ < 空格 > ]
当前句 /
/
  • 段落1
  • 第 1 句
  • 第 2 句
  • 第 3 句
  • 第 4 句
  • 第 5 句
  • 第 6 句
  • 第 7 句
  • 第 8 句
  • 第 9 句
  • 第 10 句
  • 第 11 句
  • 第 12 句
  • 第 13 句
  • 第 14 句
  • 第 15 句

+ 创建收藏夹
保存 取消