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

　　這一現(xiàn)象的存在是有許多原因的.首先，……;第二,，……;第三，……

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

　　為什么會……?一個原因是……，令一個原因是……;或許其主要原因是……

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

　　我十分贊同這一論述,即……，其主要原因如下:

　　列出解決辦法:

　　Here are some suggestions for handling … 這是如何處理某事的一些建議.

　　The best way to solve the troubles is … 解決這些麻煩的最好辦法是……

　　People have figured out many ways to solve this problem. 人們已找出許多辦法來解決這個問題.

　　批判錯誤觀點和做法:

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

　　It was obvious that …很顯然,….

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

　　可能……是對的,但這并不意味著……

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

　　認為……是很自然的,但我們不應忽視……

　　There is no evidence to suggest that … 沒有證據表明……