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 Space. I'm Clara Moskowitz. Got a minute?

点击显示原文

隐藏原文=

Searches for extraterrestrial intelligence have focused on various signs of life.

点击显示原文

隐藏原文=

And one signature of alien intelligence may be, cough, cough, air pollution.

点击显示原文

隐藏原文=

NASA's James Webb Space Telescope, due to launch in 2018, should be powerful enough to detect chlorofluorocarbons, CFCs.

点击显示原文

隐藏原文=

These ozone-destroying chemicals are used in aerosol sprays on Earth.

点击显示原文

隐藏原文=

Maybe another planet's denizens also employ them.

点击显示原文

隐藏原文=

A new analysis of this idea notes that aliens would have to be heavy users.

点击显示原文

隐藏原文=

The Webb scope could only detect the chemicals if they were 10 times more prevalent than here on Earth.

点击显示原文

隐藏原文=

And even then, the planet would have to orbit a special kind of star, a white dwarf, for the CFCs to show up.

点击显示原文

隐藏原文=

White dwarfs, the ultimate destiny of stars like the sun¡ªmaximize the pollution signal.

点击显示原文

隐藏原文=

The study is in the Astrophysical Journal.

点击显示原文

隐藏原文=

CFCs could hang around in a planet's atmosphere for a long time.

点击显示原文

隐藏原文=

So if an extraterrestrial civilization wised up and stopped polluting, we might still see the effects.

点击显示原文

隐藏原文=

Even a society that managed to destroy itself long ago could leave a chemical trace.

点击显示原文

隐藏原文=

Let's hope that's not how they discover us.

点击显示原文

隐藏原文=

Thanks for the minute, for Scientific American 60-Second Space. I'm Clara Moskowitz.

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
  • 第 16 句

+ 创建收藏夹
保存 取消