节目资讯
刊物:空中英语教室
日期:2012-11-19
难易度:High
关键字:trigger, derive, mechanism, lure, venus flytrap, predator
Hi, friends.
Thanks for joining us here today at Studio Classroom Worldwide.
My name is Steve.
If you remember back in September, we went to a place called Green World, a
nature lover's paradise.
Now while there, we met some very bizarre life forms called carnivorous plants.
Do you remember?
They're plants that trap and eat insects and, even sometimes, small creatures
like frogs and mice.
Well, our interest was surd, and we felt we just had to know more.
And so today's lesson is a closer look at plants that need a little something
more than water, dirt and sunlight to survive.
Let's get started reading on page 35.
Carnivorous Plants.
Some plants need more than just water and sunlight.
An insect flies near a plant with jaw-shaped leaves.
Suddenly the bug gets too close and brushes against tiny hairs, triggering a
trap.
The leaves snap together, imprisoning the bug inside!
This plant, called a venus flytrap, is one of many types of carnivorous plants -
plants that kill creatures for food.
Like other plants, most of these species derive energy from sunlight, but they
require additional nutrients, which they get from their prey.
Most carnivorous plants eat insects or spiders, but some can consume larger
creatures, like lizards, mice or rats.
Carnivorous plants use various mechanisms to catch their prey.
Hi, friends.
Thank you for joining us.
My name is Ryan.
And my name is Kaylah.
And today we are looking at NATURE.
Now we're looking at a very fun part of nature that maybe you've never
experienced before.
But Ryan, actually my sister had one of these things we're talking about.
We're talking about plants.
Oh, yes, but not just normal plants, friends.
Some of you might not think that plants are very interesting, but these are
carnivorous plants.
Ooh, carnivorous.
That word "carnivorous" means you eat meat.
So humans are most usually carnivorous; unless you're vegetarian, then you're
not.
But plants?
Ryan, plants usually live off of dirt, water and sunlight.
Exactly.
And we see here these plants need more than just water and dirt and sunlight,
they need meat!
Ooh! What an interesting plant.
Now there's not just one of these in the world.
There are multiples.
So let's get started looking at what a carnivorous plant looks like and how it
eats meat.
All right, friends.
So take a look now at age 35 we see here: An insect flies near a plant with
jaw-shaped leaves.
OK. If you look on page 35, you can see in the upper right-hand corner a picture
of a jaw-shaped leaf.
Now "jaw" refers to your mouth shape; so it's a shape of a mouth.
I wouldn't fly close to that, Ryan.
No, I wouldn't either if I were an insect or a bug.
And so suddenly this bug it gets too close to those kinds of leaves and brushes
against tiny hairs on them that triggers a trap.
That right.
Now "hairs," they're kind of hair-like, they're very small, soft textures that
have a nerve reaction.
And that reaction is a... they trigger this reaction to snap a trap.
All right.
If you "trigger" something, that means you cause something bad to happen.
Or to start; it doesn't always have to be bad.
Sometimes you can trigger a memory.
But to "trigger" means it's something small that causes something bigger to
start happening.
Exactly. In this case, it triggers, or starts, a trap, something that catches
that insect.
This is that plant.
The plant is eating the insect.
Now I would say, Ryan, that this is definitely a bad trigger - at least for the
bug.
Yeah, absolutely, because the leaves snap together and they imprison the bug
inside of them.
Oh, my goodness.
To imprison something means to keep it inside.
You go to prison, you are imprisoned.
You're stuck.
You cannot get out.
And well, this probably means this bug won't live very long.
No, not at all, especially when the leaves snap.
We know that means it happens very quickly.
And hey, the poor guy's stock in there.
That's right.
And if it has wings, if it's a flying bug, it would need to snap, go very
quickly, because a snap, you know, the sound of your fingers together is a...
snap.
Now that would be how fast this happens.
OK. Now this plant that we're talking about and the picture that you saw, well,
this is called a venus flytrap.
It's one of many types of carnivorous plants.
That's right. And we see here carnivorous plants - plants that kill creatures
for food.
Now a "venus flytrap," Ryan, that's actually the kind of plant my sister had.
Yeah. You know what? I had one of these too.
And I think they are probably one of the most famous carnivorous plants because
they have those jaw-shaped leaves.
And when you touch them, they close to catch the bug.
That's right.
They'll also close on your finger if you're not careful.
Yes. But it doesn't really hurt; they're really soft.
Yeah. It wouldn't hurt you, but it definitely hurts the bug.
Now let's define what a venus flytrap is.
Now it's a plant that feeds on insects and catches them by quickly closing their
two leaves shaped like a mouth.
So it's not a slow process.
This is a very fast process.
We're going to see some of the other plants that are carnivorous eat slow.
This one's famous for its speed.
That's right.
Of course, carnivorous plants kill creatures or animals or insects for food.
Now like other plants, most of these species derive, or get, all of their energy
from sunlight,
but they require additional nutrients, which they get from their prey.
Now to "derive" something means to get something from something else.
So they get energy from the sun.
Now most carnivorous plants eat insects or spiders, but some can consume large
creatures, like lizards, mice or rats.
Oh, mine! So they can actually not just eat insects but other animals as well.
Carnivorous plants use various "machenisms" or different parts to catch their
prey.
That's right.
All these different parts work together to snap or to help digest their prey or
what they're eating.
We're going to see what all these different plants look like after we watch the
skit.
(Music).
Hello, Mrs. Johnson.
I came to water your plants.
Oh, thank you, Johnny.
And I can put them in the sun too.
You know, some plants need more than just water and sunlight.
They do?
Yes. Some plants are carnivorous.
What's that?
They kill creatures for food.
Ha... You're funny, Mrs. Johnson.
No. It's true.
An insect flies near a plant with jaw-shaped leaves.
Yeah?
It brushes against it triggering a trap and snap!
Snap?
The leaves snap together imprisoning the bug.
Oh, that's scary!
(Background Noise).
Carnivorous plants require additional nutrients.
Oh. So they eat insects and spiders.
Mostly, but some consume larger creatures like lizards, mice, rats and...
Kids?
Well, not usually.
(Background Noise).
The plants use various mechanisms to catch their prey.
Oh.
Some have sticky leaves and stems.
The bugs get stuck and can not escape.
Ooey-gooey.
Others have leaves like pits, bright colors and fragrant scents lure the
insects.
And then?
And then they fall into the pits and starve or drown.
Oh, no.
And some plants suddenly suck creatures inside the plant, never to return.
Well, here's the watering can.
Let's get started.
Oh! Where did Jimmy go?
Or was it Johnny?
Oh, well.