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Within a thousand years,
在一千年里
Most domesticated animals we have today
我们现今所养的动物
Have been tamed for human use.
都被驯化为人类所用
Taming and breeding other animals is the key
驯养其它动物是人类
To the growth of our population.
人口数量增长的关键
But farming also opens up a new battlefront.
但农业也开启了一个新的战场
...against mankind's most enduring enemy:
以对抗人类最长久而顽强的敌人:
Disease.
疾病
So many of the common diseases we fear the most,
许多我们最害怕的常见疾病
syphilis, tuberculosis,
例如梅毒 肺结核
smallpox, bubonic plague,
天花 鼠疫
they came because of our living in proximity with animals.
都源于我们与动物共同生活
With hard work and a restricted diet,
由于劳作辛苦 饮食有限
We become less healthy and shorter.
我们变得不那么健康 个子更矮小
The average man is only 5 foot 3 inches tall,
男性平均身高只有5.3英尺(1.62米)
Women only 5 feet.
而女性则只有5英尺(约1.5米)
And owning land gives birth to a new enemy:
同时土地的拥有也给我们带来一个新的敌人
Each other.
人类自己
In the neighboring village, crops have failed.
在邻近的村庄 农作物歉收
