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段落1

NARRATOR

Now listen to part of a lecture from an environmental science class.

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段落2

MALE PROFESSOR

Okay, so an example of this is when chickens are used to prepare a field for planting.

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Farmers who do this have a special kind of little house that they keep their chickens in.

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This little house has four walls and a roof,

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but it doesn't have any floor.

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And it has wheels attached to it

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so it can easily be moved from one location to another.

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段落3

So, farmers move this little house to a field where something is going to be planted-

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say, bean plants...

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and then the chickens are placed inside the house...

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Now remember, there's no floor in this house.

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And what the chickens do is,

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they walk around inside the house

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and peck at the soil

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and eat any weeds or wild plants that they find...

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And then, when the chickens' re done eating the weeds in that location,

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the farmers move the house to the next section of the field...

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and again the chickens peck at the soil and eat the weeds.

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So the chickens get to eat lots of weeds, which are good for them.

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段落4

Now, this activity's also good for the bean plants that'll be growing in the field...

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because when the chickens eat the weeds,

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they're improving the quality of the soil.

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Thanks to the chickens,

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when the bean plants start to grow,

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there won't be any weeds there to compete with them for crucial resources

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like sunlight and water.

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