粗略说来，美国约占世界GDP的五分之一，但美国自己的报纸提供数据说：美国的可兑交的货币储备约占世界可兑交货币储备的百分之七十五。
Crudely put, the US possesses around one-fifth of the world's GDP, but its own paper provides around 75 per cent of the world's exchangeable currency reserves.
12亿左右的人口，约占世界人口的五分之一，生活在缺水地区(见地图)。
Some 1.2 billion people, about a fifth of the world's population, live in places that are short of water (see map).
到2050年，我国老年人口将达到四亿，约占世界老年人口的五分之一。
By 2050, the old people in China will reach 400 million, accounting for on fifth that of the world.
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