进步不能用全球平均水平来衡量。它将由我们在改善非洲人民的卫生状况方面做得如何来衡量。
Progress will not be measured by global averages. It will be measured by how well we improve the health of the African people.
发达国家的人平均预期寿命能达到80到85岁，这很大程度上应归功于饮食和公共卫生状况的改善。
On average, people in developed countries can expect to live between 80 and 85 years, largely as a result of improvements in diet and public health.
富国改善穷国卫生状况的努力成了一大迷团。
That is the big puzzle about the rich world's efforts to improve health in poor countries.
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