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In the natural world,
自然界中
animals' adaptation to their diet is clear.
動物適應飲食習慣的進化事例很多
Herbivorous grazers,
食草動物
like gazelles, have large flat back teeth,
比如羚羊 有著大而平的臼齒
useful for grinding down plants...
用來碾碎植物
Whereas carnivores, like lions,
而食肉動物 比如獅子
evolved sharp teeth to seize their prey
進化出尖銳的牙齒 得以抓住獵物
and rip their meat apart.
撕裂它們的肉
The change in our ancestors' teeth
一個新的實驗揭示了
when they started eating meat
人類祖先開始食肉后
is revealed in a new experiment.
其牙齒的變化
Professor Peter Ungar has has spent a lifetime
彼得·恩戈教授終其一生
examining the skeletons of ancient humans.
研究這些古人類的骨骼
There's one feature in particular which fascinates him.
其中有個部位特別令他癡迷
You could call him a dentist to the ancients.
簡直能當古人的牙醫了
This is a jaw of Australopithecus.
這是南方古猿人的一副頜骨
Its teeth are large, they're flat,
他的牙齒又大又平
the enamel's very thick on them.
上面有著極厚的釉質
