Life expectancy in the world’s high-income countries is now 78 years, while it is only 51 years in the least-developed countries, and as low as 40 years in some AIDS-ridden African countries. For every 1,000 children born in rich countries, seven die before their fifth birthday; for every 1,000 births in the poorest countries, 155 children die before their fifth birthday.
目前，世界上高收入国家的预期寿命是78岁，最不发达国家是51岁，而某些艾滋病肆虐的非洲国家只有40岁。富有国家每1000名出生的婴儿中有7个在5岁以前死亡；而在最为贫穷的国家里，每1000名出生的婴儿有155个在5岁以前死亡。