基本信息
4．there has been a sudden/slow/rapid fall/drop in... 在……方面骤降/下降缓慢/迅速下降 5．by comparison with... 和……相比 6．the change in...largely results from the fact that... 在……上的变化很大程度上是由……的事实造成的 7. ...is the key factor in 是……(方面)的关键因素 8．there is no doubt that... 毫无疑问…… 9．all in all，it is...that leads
