根据世卫组织的最新估计，20亿人 - 或世界人口的三分之一处于缺碘的危险。
The latest WHO estimate is that 2 billion people are at risk of becoming iodine deficient – or one third of the world's population.
半个世纪以前，城市居民只约占世界人口的三分之一，但到2005年，城市居民预计达到一半以上。
Half of a century ago, townsmen only accounted for a third of world population, but it's predicted to reach over a half until 2005.
半个世纪以前，城市居民只约占世界人口的三分之一，但到2005年，城市居民预计达到一半以上。
Half century ago, only about one third of the world population belongs to cities, but in the year 2005, it will comes to more than estimated one half.
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