(原因分析)A number of factors can account for the problems, but the followings are the most critical ones. on the one hand…, on the other hand…(适用于两点的情况)
(或者选择这个)for one thing…, for another thing…(适用于两点)On the contrary(说出相反的话一句便可),
(结论和建议)Obviously(此为过渡短语), we can draw the conclusion that...
(So)，as far as I’m concerned，it is high time that we took some measures to solve the problem before things getting worse.
1)to begin with, then, furthermore, finally(强烈推荐)
2)to start with, next, in addition, finally(强烈推荐)
3)first and foremost, besides, last but not least(强烈推荐)
9)on the one hand, on the other hand(适用于两点的情况)
10)for one thing, for another thing(适用于两点的情况)