The change of population is affected by different factors,therefore,it is very complicated to predict and control the population.It is difficullt to comprehense everything in one model considering various factors.In order to forecast the population in the future,the most important factor which may affect the populstion is the population this year the growth rate of each year afterwards.It is very easy to forecast the population according to thess two datas.
英语翻译人口的变化收到众多方面因素的影响,因此对人口的预测与控制就十分复杂,很难在一个模型中综合考虑到各个因素的影响.要