2．4．6 Compare and Analyze比较与分析
The population of the world has①increased more in modern times than in all other ages of history combined．World population②totaled about 500 million in 1650．It③doubled in the period from 1650 to 1850．Today the population is more than three billion．Estimates based on research by the United Nations indicate that it will④more than double in the next twenty-five years，reaching seven billion by the year 2000．
现代世界人口的①增长超过历史上所有其他时期的总和。1650年世界人口②总数约为5亿。1650年到1850年期间这个数字③翻了一番。如今世界人口超过了30亿。据联合国调查资料表明，估计在未来的25年时间里这个数字将会④增加一倍还不止，到2000年世界人口将达到70亿。
Notes:①The expression increase more than means增长超过in Chinese．
②Total，when used as a verb，implies总数达in Chinese．
③④We should express double correctly and appropriately，as是……的两倍，使……加倍，翻一番or增加一倍in Chinese．Similarly，treble，quadruple and other words or phrases with multiple should be exactly rendered like this one．