12 - 英语听力.mp3

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12 - 英语听力.mp3

[00:01.18]Chiru,or Tibeta...

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[00:01.18]Chiru,or Tibetan antelope,have arrived for the winter rut.
[00:13.79]In the energy-sapping thin air
[00:16.06]The males must try to control groups of females
[00:19.21]by constantly rounding them up and corralling them.
[00:31.63]But the chiru have an advantage.
[00:34.37]Their red blood cell count is twice as high as ours
[00:38.57]Sufficient to supply their muscles with oxygen even at this extreme altitude.
[00:54.25]Nevertheless,it's hard work keeping his harem in check
[00:59.05]And the male's life is about to get even harder.
[01:03.64]Another male is gearing up to steal his females.
[01:10.31]With their rapier-like horns
[01:12.58]The males won't risk fighting unless they really have to.
[01:16.53]But if neither backs down,conflict is inevitable.
[01:33.07]Some of these fights end in death.
[01:38.17]While the males fence, the females look on.
[02:04.63]Injured and weakened by the battle,the loser will be an easy target
[02:09.04]for the predators and scavengers that patrol the wilderness.
[02:16.00]Out here there's little room for mistakes.

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