10. There are different opinions among people as to……Some people suggest that ……

　　11. .It goes without saying that… 不言而喻…

　　12. It can be said with certainty that… 可以肯定的说…

　　13. What calls for special attention is that…需要特别注意的是…

　　14. There's no denying the fact that…毫无疑问，无可否认