_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*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 beli* 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……
___