This phenomenon exists for a number of reasons. First, … Second, … Third, …

　　这一现象的存在是有许多原因的.首先，……;第二,，……;第三，……

　　Why did …? For one thing …，for another …. Perhaps the primary reason is…

　　为什么会……?一个原因是……，令一个原因是……;或许其主要原因是……

　　I quite agree with the statement that … The reasons are chiefly as follows.

　　我十分赞同这一论述,即……，其主要原因如下:

　　列出解决办法:

　　Here are some suggestions for handling … 这是如何处理某事的一些建议.

　　The best way to solve the troubles is … 解决这些麻烦的最好办法是……

　　People have figured out many ways to solve this problem. 人们已找出许多办法来解决这个问题.

　　批判错误观点和做法:

　　As far as something is concerned, … 就某事而言，……

　　It was obvious that …很显然,….

　　It may be true that …, but it doesn't mean that …

　　可能……是对的,但这并不意味着……

　　It is natural to believe that …, but we shouldn't ignore that …

　　认为……是很自然的,但我们不应忽视……

　　There is no evidence to suggest that … 没有证据表明……