雅思写作：英语写作必备词汇-11　　1-tease out solutions找出解决方案; 　　2-be at the forefront of the efforts to do努力做某事; 　　3-growth flatlined增长水平下降; 　　4-It has become a bit pass to do做某事有点儿过时了; 　　5-the prime driver of traffic growth车流量多的主要因素; 　　6-public mass-transit公共交通