- that continuously pumps blood across their lungs...
能够持续将血液送至肺部 - allowing them to run without having to stop to catch their breath.
使其在奔跑时无需停下来呼吸 - Their legs extend beneath their body rather than to the side
它们的腿长在身体下方而非侧面 - so they can walk upright.
所以可以直立前行 - This allows tiny hatchlings to grow
这使小小的幼崽能够长大 - into adults that are 50 times their size.
成为体重是自己50倍的成年动物 - They're part of the reptile family tree,
它们是爬行动物家族树的一部分
so they can walk upright. 所以可以直立前行
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