在干旱的热带地区,提供灌溉水的最低成本的方法通常是建造小规模的工程。例如,在洼地收集雨水,然后将其抽调至附近的农田。
Pakistan derives about a fifth of its output from agriculture, and much of its most productive cropland is submerged or turned to the bog.巴基斯坦五分之一的产出来自于农业,但其高产量农田中已有许多被淹没或变成了沼泽。
Most of the villagers survive off tiny plots of cropland.大多数村民靠小块农地产出聊以为生。