1、Itcanbesaidwithcertaintythat...可以肯定地说......2、Whatcallsforspecialattentionisthat...需要特别注意的是3、It'sgenerallyrecognizedthat...它普遍认为...4、efore然而问题并非如此简单,所以……5、Nothingismoreimportantthanthefactthat...没有什么比这更重要的是…