But worldwide only three percent of farmers have use of a tractor.
但是世界上仅百分之三的农民使用拖拉机

Question

Machines replaced men.
机器代替了人力
A liter of oil generates as much energy...
一升石油产生的能量
As 100 pairs of hands in 24 hours,
相当于100双手劳作24小时
But worldwide only three percent of farmers have use of a tractor.
但是世界上仅百分之三的农民使用拖拉机
Nonetheless, their output dominates the planet.
尽管如此他们的产出在地球上占多数
In the united states, only three million farmers are left.
在美国只剩三百万农民
They produce enough grain to feed two billion people.
他们生产的粮食可以养活20亿人

来自《家园第一部分 Home Part1》第 327 行