- Their young are born fully formed...
幼崽一出生就完全成型 - ...able to walk within hours of birth...
出生后几小时就能行走 - and follow their herd in search of fresh growth.
并跟随兽群寻找新长出的草 - Mammals have truly conquered the grassy plains...
哺乳动物真正征服了草原 - their huge numbers the most obvious sign of this exceptional success.
它们庞大的数量 就是巨大成功的最明显的标志 - But just as some mammals evolved to feed on the grass,
但在一些哺乳动物 进化成以草为食的同时 - others evolved to feed on the grazers.
另一些哺乳动物 则进化为以食草动物为食
Mammals have truly conquered the grassy plains... 哺乳动物真正征服了草原
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