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第1段

1 .<-NARRATOR:-> Listen to part of a lecture in a biology class.

请听生物课上的部分内容。

第2段

1 .<-FEMALE PROFESSOR:-> Now, plants, like animals,

植物,和动物一样,

2 .and like us for that matter,

在这方面和我们人类也一样,

3 .need nutrients...

都需要营养物质,

4 .substances that provide nourishment...

也就是能够供给我们生存、发育和成长

5 .to survive, thrive, and grow.

所需营养的物质。

6 .We get our nutrients from the food we eat.

我们人类从所食用的食物中获取营养物质。

7 .Plants, though-

而植物,

8 .most plants anyway-

大部分植物,

9 .absorb their nutrients from the soil,

都是从土壤中吸收养分的,

10 .right, through their root systems?

对吗?通过它们的根部系统。

11 .OK. But there are plants that don't get their nutrients from the soil.

但是也有植物不是从土壤中获得营养物质的。

12 .The places they grow, the soil is bad, so they get their nutrients from insects instead.

在它们生长的地方,土质不好。所以它们从虫子身上获取营养。

13 .From trapping and digesting insects.

把他们困住并消化掉

14 .They're called carnivorous plants.

这些植物就被称为“食肉植物”。

第3段

1 .Carnivorous plants capture insects in different ways-they have different trapping mechanisms-

食肉植物通过各种不同的方法抓住昆虫。它们有不同的陷阱机制:

2 .active traps

主动陷阱

3 .and passive traps.

和被动陷阱。

第4段

1 .A plant with an active trap . . .

关于带有主动陷阱的植物的

2 .ah, a good example is

一个很好的例子,

3 .the [slowly; pronounced] Venus flytrap.

就是捕蝇草。

4 .The Venus flytrap actually moves to catch its prey...

捕蝇草在捕捉猎物的时候会真的动起来,

5 .or parts of it do, anyway.

或者,不管怎么样,

6 .Its leaves... it has special leaves that are hinged in the middle.

它的某些部位会活动起来。捕蝇草长着很特别的叶子,会在中间折合起来。

7 .The two halves of the leaf open and close, sort of like

这些叶子的两半通过开开合合来捕捉昆虫,

8 .a mouth, to catch insects.

就像一张嘴一样。

9 .And on these leaves is a sweet nectar that attracts insects.

在这些叶子上有一种能够吸引昆虫的甜甜的花蜜。

10 .Insects like this sweet stuff.

昆虫很喜欢这种甜甜的东西。

11 .And, and, when they get lured in and land on the leaf-

而一旦它们被引诱着落在了叶子上,

12 .wham! the leaf springs shut.

“砰”地一下,叶子就会闭合起来。

13 .It's an active trap.

这就是一个主动陷阱。

14 .And the insect springs it, so to speak-

而且可以说是昆虫使它闭合起来的。

15 .the leaf quickly closes and forms a little cage, trapping the insect between the leaves.

叶子快速闭合形成了一个小小的笼子,把昆虫困在了叶子之间。

16 .The Venus flytrap is then able to digest the insect,

然后捕蝇草就可以把昆虫消化掉

17 .and get its nutrients.

并得到它的营养物质了

第5段

1 .But other carnivorous plants...

但是其他的食肉植物,

2 .their methods are passive,

它们的方法是被动的。

3 .they don't have any moving parts to trap things.

它们并没有任何可以活动的部位来困住东西。

4 .They have passive traps.

它们有被动陷阱,

5 .Like the sundew plant.

像茅膏菜一样。

6 .The sundew plant also produces a sweet nectar that attracts insects. Its leaves are full of little hairs that secrete the sweet substance.

茅膏菜也会分泌出一种能够吸引昆虫的甜甜的花蜜。它的叶子上长满了能够分泌甜蜜物质的毫毛。

7 .But what happens when insects land on the sundew's leaves to get at the sweet nectar?

不过,当昆虫落在茅膏菜的叶子上想要吃掉这些甜甜的花蜜时,会发生什么呢?

8 .Well, unfortunately for the insects,

对这些昆虫来说很不幸的是,

9 .the hairs on the leaves also produce a super sticky, glue-like substance-so an insect gets stuck in them and can't fly away.

叶子上的这些毫毛同时也分泌出了一种超级黏的,像胶一样的物质。于是昆虫会被困在那儿,没有办法飞走。

10 .It, it basically gets glued there,

它基本上会一直被黏在那儿,

11 .allowing the sundew to digest it

以便于茅膏菜将它消化

12 .and absorb nutrients.

并吸收营养物质。