据达尔文理论，长颈鹿几千年来的长脖子，是由于长脖子基因在漫长的演变过程中，逐渐占据上风。
By Darwinist thinking, giraffes got their long necks over millennia because genes for long necks had, very slowly, gained advantage.
长颈鹿是一种有长脖子的动物。
虽然长颈鹿长这么高，但是它们是所有哺乳动物里面睡得最少的，平均每天睡半个小时就够了。
Despite their height, giraffes actually have the shortest sleep requirement of all mammals, surviving on an average of half an hour a day.
长颈鹿获得遗传的特征长脖子是由于它们世世代代啮食树上部的树叶的原故。
A giraffe acquired the genetic specification for a long neck through generations of browsing upon the upper foliage of trees.
长颈鹿获得遗传的特征长脖子是由于它们世世代代啮食树上部的树叶的原故。
A giraffe acquired the genetic specification for a long neck through generations of browsing upon the upper foliage of trees.
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