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段落1

NARRATOR

Now listen to part of a lecture in a biology class.

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请听生物课上的部分内容。

段落2

MALE PROFESSOR

OK, so let's talk about what happened to a certain type of insect-

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好了,我们来讲讲某种昆虫的遭遇,

a moth, a red and black moth that lives in Europe.

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这是一种蛾子,一种生活在欧洲的红黑色飞蛾。

These moths eat a plant called ragwort,

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这种蛾子以狗舌草为食,

and they live in fields where the ragwort plants grow.

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生活在狗舌草生长的田野里。

Now, there was a group of moths that lived in one of these fields...and for many years, there was a lot of ragwort growing there.

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现在,有一群飞蛾就生活在其中一片这样的田野里,多年以来,那里的狗舌草都生长得十分旺盛。

So the moths had plenty to eat,

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所以飞蛾有大量的食物可以食用,

and the total number of moths in the field stayed pretty much the same.

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那片田野里的飞蛾总数也基本保持不变。

But then one year it rained a lot less than usual,

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然而,有一年降雨较之往年少了许多,

and the ragwort didn't grow as well.

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狗舌草的长势也不好。

The result was that the moths didn't get enough to eat, and many didn't survive...

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结果导致飞蛾食物不足,许多蛾子无法存活,

but even the ones that did survive didn't lay as many eggs as before.

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即使有些飞蛾得以幸存,它们所产的卵也不如往年多。

So that year the moth population in the field was quite a bit smaller.

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所以那一年那片田野的飞蛾总数减少了许多。

段落3

The next year, though, the amount of rainfall returned to normal again.

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不过,下一年降雨量还是恢复到了正常水平,

Many more ragwort plants grew, and once again there was a lot available for the moths to eat.

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狗舌草也长势喜人,飞蛾也再次有了足够的食物。

So that year the moth population increased

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于是那一年飞蛾总数有所增加,

and the female moths laid many more eggs than the year before.

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母蛾产卵量也比前一年多了许多。

And now, after all that rainfall and plant growth,

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现在,多亏了这些降雨和茂盛的狗舌草,

there were just as many moths in the ragwort field as there were before.

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那片狗舌草地里的飞蛾数量恢复到了从前的水平。
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