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 Cynthia Graber. Got a minute?

点击显示原文

隐藏原文=

They were thought to have great promise in the fight to stop the spread of AIDS.

点击显示原文

隐藏原文=

Indeed, vaginal microbicides did a fine job killing HIV in the lab.

点击显示原文

隐藏原文=

But they failed to work in clinical trials.

点击显示原文

隐藏原文=

Now, researchers think they have identified the culprit: semen.

点击显示原文

隐藏原文=

In previous studies, scientists had looked at the HIV virus on cells protected by microbicides.

点击显示原文

隐藏原文=

But the latest tests evaluated microbicides in the more real-world situation where semen is present.

点击显示原文

隐藏原文=

And semen stopped the microbicides from working.

点击显示原文

隐藏原文=

Probably because semen contains protein fragments that help HIV to attach to cell surfaces and infect cells.

点击显示原文

隐藏原文=

The research is in the journal Science Translational Medicine.

点击显示原文

隐藏原文=

There's good news, though, a drug not currently used as a microbicide did seem to offer protection.

点击显示原文

隐藏原文=

It's an antiretroviral called Maraviroc.

点击显示原文

隐藏原文=

Conventional microbicides target the virus itself.

点击显示原文

隐藏原文=

But Maraviroc binds to receptors on host cells.

点击显示原文

隐藏原文=

That action forms a barrier that prevents the HIV virus from attaching to the cell.

点击显示原文

隐藏原文=

Maraviroc is currently approved as an HIV drug, and is being considered as a microbicide to try to stop infection in the first place.

点击显示原文

隐藏原文=

The research is a reminder that, in drug testing, context is crucial.

点击显示原文

隐藏原文=

Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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
  • 第 18 句

+ 创建收藏夹
保存 取消