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第1段
1 .<-NARRATOR:-> Now listen to part of a lecture in a biology class.
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第2段
1 .<-MALE PROFESSOR:-> We have a good example of this with the skunk.
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2 .As most of you know, the skunk is a furry little mammal that can be found throughout North America.
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3 .Skunks have a very distinctive marking.
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4 .Their body is mostly black, and they have a big white stripe that runs from the top of their head,
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5 .all the way down their back, and along their big, bushy tail.
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6 .So they're very easy to see
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7 .and very easy to recognize, even from a distance.
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第3段
1 .Skunks also have special glands under their tail that produce a terrible-smelling liquid.
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2 .And when skunks are approached by a predator, they lift their tail and spray the predator with this liquid.
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3 .For example, let's say a wolf is preparing to attack a skunk.
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4 .As the wolf approaches,
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5 .the skunk lifts its tail and sprays the wolf.
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6 .That's very, very unpleasant for the wolf,
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7 .because it's now covered with this repulsive, foul-smelling liquid.
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8 .The wolf doesn't want to be sprayed again, so it backs off and leaves the skunk alone.
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9 .And from then on, whenever that wolf sees a furry little black body, with a big white stripe running from its head to its tail,
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10 .it'll recall that terrible smell,
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11 .and it'll be sure to stay
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12 .far away.
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