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

Listen to part of a lecture in a botany class.

点击显示原文

隐藏原文=

段落2

Hi, everyone. Okay.

点击显示原文

隐藏原文=

Today, I will lecture on some pretty strange plants.

点击显示原文

隐藏原文=

As a matter of fact, the plants we will discuss are from the family Rafflesia, a parasitic plant.

点击显示原文

隐藏原文=

So, without further delay, I will begin.

点击显示原文

隐藏原文=

The Rafflesia is a genus of parasitic flowering plants.

点击显示原文

隐藏原文=

It contains, um ...15-19 species,

点击显示原文

隐藏原文=

all found in southeastern Asia, let's see, on the Malay Peninsula, Borneo, Sumatra, West Malaysia, and the Philippines.

点击显示原文

隐藏原文=

The flowers have no leaves and hardly any stem,

点击显示原文

隐藏原文=

just a huge, speckled, fivepetal flower with a diameter of up to 106 cm, and it weighs up to 10 kg.

点击显示原文

隐藏原文=

Even the smallest species, um, R. manillana, has 15-inch-diameter flowers.

点击显示原文

隐藏原文=

The flowers smell like rotting meat, so we get certain local names for these plants which translate to,

点击显示原文

隐藏原文=

um, "corpse flower" or "meat flower."

点击显示原文

隐藏原文=

The vile smell that the flower gives off can sometimes attract flies, which these plants use as a food source.

点击显示原文

隐藏原文=

Additionally, it is parasitic on vines In the genus Vitaceae,

点击显示原文

隐藏原文=

spreading its roots inside the vine.

点击显示原文

隐藏原文=

Now, let's talk about specific varieties of Aafflesia.

点击显示原文

隐藏原文=

I'll begin with the Nepenthes rafflesiana,

点击显示原文

隐藏原文=

a species of pitcher plant named after Stamford Raffles,

点击显示原文

隐藏原文=

the founder of Singapore.

点击显示原文

隐藏原文=

This plant has a very wide distribution covering, um,

点击显示原文

隐藏原文=

Borneo, Sumatra, Peninsular Malaysia, and Singapore.

点击显示原文

隐藏原文=

N. raffle-slana is extremely variable with numerous forms and varieties.

点击显示原文

隐藏原文=

For example, in Borneo alone,

点击显示原文

隐藏原文=

there are at least four distinct varieties.

点击显示原文

隐藏原文=

The most impressive form, known as N. rafflesiana gigantea, produces enormous pitchers.

点击显示原文

隐藏原文=

These pitchers, or heavily modified ¡¤leaves,

点击显示原文

隐藏原文=

are used to capture and kill insect prey for nutrients.

点击显示原文

隐藏原文=

段落3

Well, like it or not, all Nepenthes are, um, passive carnivores.

点击显示原文

隐藏原文=

They are classified passive because they have no moving parts,

点击显示原文

隐藏原文=

unlike their distant cousins the Venus flytrap, an active carnivore.

点击显示原文

隐藏原文=

Okay ... So the N. rafflesiana kills by luring its prey into its, ah, pitchers,

点击显示原文

隐藏原文=

whose peristomes secrete sweet-tasting nectar.

点击显示原文

隐藏原文=

Once the insect is inside, it quickly finds the walls of the pitcher too slippery to scale and,

点击显示原文

隐藏原文=

as you may expect,drowns.

点击显示原文

隐藏原文=

Digestive enzymes released by the plant into the liquid break down the prey and,

点击显示原文

隐藏原文=

um, release soluble nutrients, which are absorbed by the plant through the walls of the pitcher.

点击显示原文

隐藏原文=

The carnivorous nature of Nepenthes is supposedly a consequence of,

点击显示原文

隐藏原文=

um, living in nutrient-poor soils since the main method of nutrient absorption in most plants,

点击显示原文

隐藏原文=

the root, is insufficient in these soils, so the plants have evolved other ways to gain nutrients.

点击显示原文

隐藏原文=

Let's see, yes, finally, N. rafflesiana enjoys hot, humid conditions most of the time,

点击显示原文

隐藏原文=

as found in tropical jungle lowlands.

点击显示原文

隐藏原文=

段落4

Okay, so far so good.

点击显示原文

隐藏原文=

The next plant I will discuss is the, um ... where are my notes, ah, here we go,

点击显示原文

隐藏原文=

Rafflesia arnoldii, another member of the genus Rafflesia.

点击显示原文

隐藏原文=

Not only is it the world's largest flower,

点击显示原文

隐藏原文=

but it is also one of the most bizarre and improbable organisms on the planet.

点击显示原文

隐藏原文=

There are some plants with larger flowering organs,

点击显示原文

隐藏原文=

for example, the Titan Arum and Talipot,

点击显示原文

隐藏原文=

but these are technically clusters of many flowers.

点击显示原文

隐藏原文=

Rafflesia arnoldii is the largest, and you can take this to the bank,

点击显示原文

隐藏原文=

because its flower attains a diameter of nearly three feet and can weigh up to,

点击显示原文

隐藏原文=

get this, 24 pounds!

点击显示原文

隐藏原文=

段落5

It lives as a parasite on the Tetra Stigma vine,

点击显示原文

隐藏原文=

as its host, which grows only in undisturbed rainforests.

点击显示原文

隐藏原文=

White many parasites appear like normal plants,

点击显示原文

隐藏原文=

um, Rafflesia lacks any observable leaves, roots, or even stems,

点击显示原文

隐藏原文=

and this is what makes it so strange.

点击显示原文

隐藏原文=

A lot like fungi, Rafflesia individuals grow as thread-like strands of tissue

点击显示原文

隐藏原文=

completely embedded within and in intimate contact with surrounding host cells from which, um, nutrients and water

点击显示原文

隐藏原文=

are obtained. The only part of Rafflesia that is identifiable as distinctly plant-like are the, ah,

点击显示原文

隐藏原文=

flowers, although even these are bizarre because they attain a massive size and are usually reddish-brown and stink of rotting flesh.

点击显示原文

隐藏原文=

The flower is pollinated by, uh, oh my goodness,

点击显示原文

隐藏原文=

flies ... which are attracted by its scent.

点击显示原文

隐藏原文=

Aafflesia arnoldii is very rare and fairly hard to locate.

点击显示原文

隐藏原文=

It is especially difficult to see in flower because the buds take many months to develop,

点击显示原文

隐藏原文=

and the flower lasts for just a few days.

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
  • 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
  • 第 19 句
  • 第 20 句
  • 第 21 句
  • 第 22 句
  • 第 23 句
  • 第 24 句
  • 第 25 句
  • 第 26 句
  • 第 27 句
  • 第 28 句
  • 段落3
  • 第 29 句
  • 第 30 句
  • 第 31 句
  • 第 32 句
  • 第 33 句
  • 第 34 句
  • 第 35 句
  • 第 36 句
  • 第 37 句
  • 第 38 句
  • 第 39 句
  • 第 40 句
  • 第 41 句
  • 第 42 句
  • 段落4
  • 第 43 句
  • 第 44 句
  • 第 45 句
  • 第 46 句
  • 第 47 句
  • 第 48 句
  • 第 49 句
  • 第 50 句
  • 第 51 句
  • 第 52 句
  • 第 53 句
  • 段落5
  • 第 54 句
  • 第 55 句
  • 第 56 句
  • 第 57 句
  • 第 58 句
  • 第 59 句
  • 第 60 句
  • 第 61 句
  • 第 62 句
  • 第 63 句
  • 第 64 句
  • 第 65 句
  • 第 66 句
  • 第 67 句

+ 创建收藏夹
保存 取消