辽阔草原 17 - 英语听力.mp3

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辽阔草原 17 - 英语听力.mp3

[00:00.000]Pygmy hogs are...

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[00:00.000]Pygmy hogs are no bigger than rabbits.
[00:03.605]They're the tiniest and rarest of all wild pigs.
[00:07.605]The female is busy collecting grass
[00:12.103]but not for eating.
[00:14.107]She's building a nest.
[00:18.352]Each piglet may be small enough
[00:22.854]to fit in the palm of a hand
[00:24.593]but she does have ten.
[00:27.104]This is
[00:29.361]how grass can grow given unlimited sunshine and water
[00:33.856]but on most tropical plains across our planet
[00:37.606]the wet season is followed by a dry one.
[00:40.853]On the African savannas,
[00:45.855]grazers are marching in search of grass and water.
[00:50.099]Without rain,
[00:53.104]these plains can become dust bowls.
[00:56.107]Grass can now loose its hold.

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辽阔草原 17 - 英语听力.mp3

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