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

NARRATOR

Now listen to part of a lecture on the topic you just read about.

点击显示原文

隐藏原文=

段落2

FEMALE PROFESSOR

Unfortunately, the methods described in the passage have serious limitations that make them ineffective or impractical in many situations.

点击显示原文

隐藏原文=

段落3

Precautions like cleaning shoes and using bike scrubbers might help a little but they will not make a huge impact.

点击显示原文

隐藏原文=

The problem is that P. ramorum spores do not spread just through human assistance.

点击显示原文

隐藏原文=

Studies have detected the spores in water streams following rainfall.

点击显示原文

隐藏原文=

It appears that the spores are frequently picked up by rainwater and washed into water streams, which then carry them long distances.

点击显示原文

隐藏原文=

This type of water-assisted spread is much harder to control.

点击显示原文

隐藏原文=

段落4

Second, the fungicides referred to in the reading provide effective protection against P. ramorum only when they’re injected directly into the tree trunks.

点击显示原文

隐藏原文=

But their effect lasts only for a few months, so the injections have to be repeated.

点击显示原文

隐藏原文=

Now, this type of treatment might work if you want to protect a few oak trees in a city park, but it’s just not very practical in protecting whole forests that contain thousands and thousands of oak trees.

点击显示原文

隐藏原文=

Can you imagine forest managers having to inject every single oak in a large forest with a dose of fungicide every few months?

点击显示原文

隐藏原文=

That sounds impractical and also too expensive.

点击显示原文

隐藏原文=

段落5

Third, as the reading explains, clear-cutting destroys the vegetation around the sick oak trees, because some of that vegetation may be infected.

点击显示原文

隐藏原文=

But keep in mind that some of that surrounding vegetation is in fact healthy, and it gets destroyed in the process anyway.

点击显示原文

隐藏原文=

Now, in some forests it makes sense to sacrifice some healthy vegetation in order to stop the spread of a dangerous disease.

点击显示原文

隐藏原文=

However, the vegetation in many forests of the western United States includes tree species that are very rare and cannot grow back easily.

点击显示原文

隐藏原文=

So, clear-cutting in these forests would mean destroying many healthy rare trees.

点击显示原文

隐藏原文=

This would represent a greater ecological damage than the P. ramorum damage we’re trying to prevent.

点击显示原文

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