Anything that can increase farming efficiency—the amount of crops we can produce peracre of land—will be extremely useful.
任何能提高农业效率的东西——能提高我们每英亩土地生产的农作物数量的东西——都是非常有用的。
2
By chemically extracting nickel form the ash, they produced 100 pounds of nickel peracre of land at a total cost per pound slightly above that of current mining.
通过化学方法从灰烬中提取镍,他们每英亩土地生产了100磅镍,每磅的总成本略高于目前的采矿成本。
3
According to farmers' report, the amount of insecticide needed peracre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not.