纪录片《熟食造就了人类吗》 第17期：不同时期的人类牙齿

（单词翻译）

This is the more recent human ancestor.

这是出现得晚一点的人类祖先

Its teeth are smaller, they're crustier,

它的牙齿小一些 却更坚硬

and the enamel¹ is thinner.

釉质也变薄了

Professor Ungar wants to find out

恩戈教授想探究

how these very different sets of teeth have adapted to different diets.

各式各样的牙齿是如何适应不同饮食结构的

Enter the BITE Master II.

咀嚼模拟器II出场

This unique machine simulates² chewing.

唯一能够模拟咀嚼的机器

It will put these ancient jaws³ to the test.

我们将用它检测这些古老的颌骨

We're going to set it chewing on different sorts of foods

我们会让它们咀嚼不同的食物

and try and see how the different teeth

努力观察不同的牙齿

affect the way the food's broken down during the chewing.

咀嚼时食物破碎的方式

This is the first time in three million years

这是这些南方古猿的牙齿

that these australopithecus teeth have seen action.

三百万年以来第一次运动

So how will they fare against a raw carrot?

它们进食生胡萝卜时效果如何呢

OK, give it a shot.

好了 试一下吧