原文视听

The results reveal the extraordinary effect
实验结果揭示 烹煮过的食品
that cooking food has on easing its way through the snake's body.
确实更易被蟒蛇吸收 并产生重大影响
So when we feed the python a ground, cooked steak
我们发现消化搅碎后的熟牛排
we find that the energy expended on digestion assimilation
所消耗的能量 比消化未加工的生牛排
has decreased by 24% compared to the intact, raw steak.
所消耗的能量少24%
The figure has huge significance.
这个数字非常重要
It shows that eating cooked food reduces by a quarter
它告诉我们 吃熟食比吃生食
the energy required to carry out the process of digestion.
消耗的能量要少四分之一
Professor Wrangham claims that this extra energy
朗汉教授称这些多余的能量
caused the dramatic adaptations in Homo erectus.
使直立人发生重大适应性变化
Cooking made our guts smaller.
烹饪使我们的肠道变小
Once we cooked our food,
我们烹饪食物后
we didn't need big guts,
就不需要大肠胃去消化
and big guts were a disadvantage...
大肠道对于我们很不利
they're costly in terms of energy.
它们消耗的能量较多
So those individuals that were born with small guts
那些生来具有小肠胃的个体
were able to save energy and therefore have more babies and survive better.
才能节约能量 从而生育更多后代并活得更好

重点解释

So when we feed the python a ground, cooked steak we find that the energy expended on digestion assimilation has decreased by 24% compared to the intact, raw steak.我们发现消化搅碎后的熟牛排所消耗的能量，比消化未加工的生牛排所消耗的能量少24%。

expend on消耗在

Large sums were expended on model farms.

大宗金钱费于建设模范农场。

Don't expend all your energy on such a useless job.

不要把你的精力全花在这无益的工作上。

compared to与 ... 相比

Teachers are often compared to burning candles.

人们总是把老师比喻为燃烧的蜡烛。

Life is poetically compared to the morning dew.

在诗歌中，人生被比喻为朝露。

they're costly in terms of energy.它们消耗的能量较多

in terms of用…的话,以…的措辞,在…方面,从…方面(来说),以…表示,根据,按照

In term of money, he's quite rich, but not in term of happiness.

就钱来说他很富有，但就幸福来说就不然了。

The figures are expressed in terms of a percentage/in percentage terms.

那些数字是以百分数表示的。