1. 动名词和名称不可以算是平行吗? 2. To develop more accurate population forecasts,demographers would have to know a great deal more than they do now about the social and economical. 整个句子框架是现在时啊,为什么用would呢?
2. To develop more accurate population forecasts,demographers would have to know a great deal more than they do now about the social and economical (status/structure?). 整个句子框架是现在时啊,为什么用would呢?
2. To develop more accurate population forecasts,demographers would have to know a great deal more than they do now about the social and economical (status/structure?). 整个句子框架是现在时啊,为什么用would呢?