雅思写作常用词汇：增加/增大

　　increase/raise/extend/boost/expand/enhance/intensify/elevate/multiply;

　　shoot up迅速上升

　　- eg: The number shoots up over the nest two hours, peaking at 1000 at 8 am.;

　　soar猛增/高涨;

　　skyrocket飞涨/激增;

　　decline/fall/drop/decrease/reduce下降/减少。