Their age can be determined by extrapolation from their growth rate.它們的年齡可從其生長速度來推定。

　　Multiplication of cells leads to rapid growth of the organism.細胞的繁殖導致有機體的迅速生長。

　　Economic growth is expected to average 2% next year.明年經濟增長預計平均可達2%。

　　The new trade agreement should facilitate more rapid economic growth.新貿易協定應當會加快經濟發展。

　　The government is determined to check the growth of public spending.政府決心要控制公共開支的增長。