The Aswan Dam, for gwymple, stopped the Nile flooding but deprived Egypt of the fertile silt that floods left-all in return for a giant reservoir of disease which is now so full of silt that it barely generates electricity.

• 例如，阿斯旺大坝使得尼罗河不再洪水泛滥，但是它也夺去了埃及以前所享有的洪水留下的肥沃淤泥--这些换宋的就是这么个疾病滋生的水库，现在这个水库积满了淤泥，几乎不能发电了。