A giraffe, for example, might grow a longer neck because it was useful for eating food that other giraffes could not reach. Its progeny would then inherit the attribute.
比如说，一只长颈鹿之所以会长出长长的脖子是因为它能够吃到其他长颈鹿吃不到的食物，而它的后代就会继承这项特质。
'he is really muscly - giraffes fight with their necks, and if you look at the size of this one's neck then you can see how thick it is - he must have been in a lot of fights!
它真的很强壮。长颈鹿们用脖子斗殴，如果你注意这只长颈鹿脖子的大小，那么你就能明白它有多厚了。它一定身经百战！
Just looking at these slumbering giraffes is enough to give you a crick in the neck - which is why the world's tallest animals don't often stop for a snooze.
看着这些睡觉的长颈鹿你都会觉得脖子累，这就是为什么这种世界上最高的动物通常不会随便停下打个盹儿。
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