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The gas given off contains two carbon isotopes.
釋放出的氣體包含兩種碳同位素
The ratio of one to the other will indicate
兩種同位素之間的比例可以說明
whether our ancestors were foraging in woods
我們的祖先是在森林中覓食
or going out to the grass-rich plains.
還是去綠草如茵的平原覓食
The result will reveal the sort of food eaten by ancient humans
結果將揭示古人類食用食物的種類
and the environment in which they lived.
以及他們所生存的環境
So far, Julia's research has revealed
迄今為止 朱莉婭的研究表明
that in the period leading up to the evolution of habilis,
我們祖先在進化成能人之前
there was a massive change in the lifestyle of our ancestors.
生活方式發生了巨大變化
The results tell us that our ancestors changed
結果告訴我們人類祖先
from a forest-orientated kind of diet and environment,
從森林導向的飲食起居方式
to one which concentrated on the grasslands.
向草原導向的生活方式轉變
It's telling us that our ancestors ate
由此我們知道他們
animals which ate the grasses.
曾食用食草動物
But it's not just the tooth enamel
但不僅僅牙釉質
which shows a change in the diet of our ancestors -
顯示了我們祖先的飲食變化
it's the tooth's shape itself which shows
牙齒形狀本身也給出了
clues as to what they ate.
他們食用何物的線索
