英语听力：2013-04-26 恐龙之战之极限生存 Extreme Survivors—17
时间：2014-02-12 05:43:19
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（单词翻译）
It's a digestive process more like those of carnivores. And Sauroposeidon has another trick for growing to mammoth1 proportions--hollow bones. Its backbone2, neck, and ribs3 have walls just a few milometer’s thick. Even its limbs are far less dense4 than the bones of many mammals.
To look at these big sauropods like Sauroposeidon, they're growing to 20, 30, 40, 50 tons, and they're doing it in a space of just two or three decades.
Sauropods grow in
spurts5, depending on their age, the season, and the availability of food. Scientists know this because their growth is recorded as rings, like rings in a tree trunk.
For the first few years of a Sauroposeidon's life,
predators6 are at every turn. One of the most common, Deinonychus is also one of the most deadly.
Cunning, definitely cunning. Big brain. Smart.
It's the sort of creature that seems very adapt for doing a lot of damage in a short amount of time.
Nasty. Deinonychus is a very, very nasty animal that, you know, you meet up with one of these, and your chances of being disemboweled are pretty great.
For something like Deinonychus, Sauroposeidon will be a great meal.
For the herbivore Sauroposeidon, death by Deinonychus is violent and painful. It's a kill not unlike today's
hyenas7, one of the Serengeti's most effective predators.
While
juveniles11 fight it out in the woodlands, adult Sauroposeidon are, as always,
foraging12 for food. With their tiny brains, they live in a world of oblivion, seemingly
unaware13 of the fate of their offspring.
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