纪录片《熟食造就了人类吗》 第15期：古人的饮食起居（在线收听）

The gas given off contains two carbon isotopes.

释放出的气体包含两种碳同位素

The ratio of one to the other will indicate

两种同位素之间的比例可以说明

whether our ancestors were foraging in woods

我们的祖先是在森林中觅食

or going out to the grass-rich plains.

还是去绿草如茵的平原觅食

The result will reveal the sort of food eaten by ancient humans

结果将揭示古人类食用食物的种类

and the environment in which they lived.

以及他们所生存的环境

So far, Julia's research has revealed

迄今为止 朱莉娅的研究表明

that in the period leading up to the evolution of habilis,

我们祖先在进化成能人之前

there was a massive change in the lifestyle of our ancestors.

生活方式发生了巨大变化

The results tell us that our ancestors changed

结果告诉我们人类祖先

from a forest-orientated kind of diet and environment,

从森林导向的饮食起居方式

to one which concentrated on the grasslands.

向草原导向的生活方式转变

It's telling us that our ancestors ate

由此我们知道他们

animals which ate the grasses.

曾食用食草动物

But it's not just the tooth enamel

但不仅仅牙釉质

which shows a change in the diet of our ancestors -

显示了我们祖先的饮食变化

it's the tooth's shape itself which shows

牙齿形状本身也给出了

clues as to what they ate.

他们食用何物的线索