- strengthened to prevent silica in the grass from wearing them out...
能够防止草中的二氧化硅磨损牙齿 - and huge bellies to process it all.
巨大的腹部 用于将草消化 - 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
...able to walk within hours of birth... 出生后几小时就能行走
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