Well, by 2050 scientists estimate that up to a hundred and fifty million people in the developing world may be on the verge of protein deficiency, due to the decreasing levels of protein in their staple foods.

好吧，科学家估计， 到 2050 年，由于主食中蛋白质含量的下降， 发展中国家多达 1. 5 亿人可能处于蛋白质缺乏的边缘。