专家们预计，这些国家的人口到21世纪末将减少一半以上。

Experts estimated that the population of these countries will be reduced to 21, more than half of the end of the century.

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随着气象形式的变化有所增加，专家们预计出现的情况会更糟糕。

With increased variation in weather patterns, experts envisage far worse to come.

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专家们预计，为了应对增长需求，发达国家的运营商们必需要架设的发射塔数量是现有数量的三倍。

Experts predict that to meet the growing demand, operators in developed countries may have to treble the number of base stations.

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