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 Lee Billings. Got a minute?

点击显示原文

隐藏原文=

Outer space may look mostly empty, but it's actually packed with cosmic radiation,

点击显示原文

隐藏原文=

gamma rays and charged particles produced by exploding stars, black holes and other violent astrophysical phenomena.

点击显示原文

隐藏原文=

Earth's atmosphere and magnetic field keep us safe from the worst of this steady barrage of subatomic bullets.

点击显示原文

隐藏原文=

But cosmic radiation would be a constant concern for astronauts on lengthy interplanetary voyages.

点击显示原文

隐藏原文=

NASA and other space agencies have known for decades that this radiation can cause cancer and other cell damage.

点击显示原文

隐藏原文=

However, possible effects on mental functioning have been difficult to test.

点击显示原文

隐藏原文=

But a new study shows that, in mice at least, cosmic radiation likely causes cognitive impairment.

点击显示原文

隐藏原文=

The research is in the journal Science Advances.

点击显示原文

隐藏原文=

The researchers mimicked cosmic-radiation exposure by briefly bombarding the brains of lab mice with high-energy particles.

点击显示原文

隐藏原文=

Six weeks later, the mice scored poorly on tests of learning and memory,

点击显示原文

隐藏原文=

they displayed less curiosity and more confusion than an unexposed control group.

点击显示原文

隐藏原文=

Analysis of their brains revealed inflammation and decreased numbers of dendrites, which transmit signals between nerves.

点击显示原文

隐藏原文=

If humans are similarly susceptible, astronauts on voyages to Mars could suffer permanent cognitive impairment that could hinder their abilities to recall information and to think on their feet.

点击显示原文

隐藏原文=

Faster transits, new antiradiation drugs and better spacecraft shielding should help.

点击显示原文

隐藏原文=

But until those solutions are developed, sending brain-damaged humans to Mars would be a dim-witted thing to do.

点击显示原文

隐藏原文=

Thanks for the minute, for Scientific American's 60-Second Science. I'm Lee Billings.

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
  • 第 17 句

+ 创建收藏夹
保存 取消