And I would like to present two explanations for this:
對于此，我有如下兩點愚見：
The reasons are chiefly as follows. 主要原因如下：
There are numerous reasons why ____, and I would like to explore a few of the most important ones here.
為什么___________，原因很多，在此列舉幾個較為重要的原因
The reasons are presented below. 原因如下。
There are three premier(主要的)/best/ most important, largest, significant, obvious, crucial causes as follows.
以下這些是造成這一問題的最主要//最重要//最有意義/明顯/至關(guān)重要的原因。
This is based on the propensity(傾向，原因) of following points.
這基于以下的原因。
The main reason is that.. 主要原因是_____________。
One very important argument for ..... is that....
_______的非常重要的原因便是____________________。
The reasons are quite clear. Above all, ....
原因非常清楚。首先(首要的是)__________。
The first reason can be seen by every person.
第一個原因其實很明顯。
The first and most important reason is that.....
第一個而且最重要的原因是______________。
One of the reasons that are given for....is that....
______________的原因之一是__________________。
Perhaps this is because of the simple fact that.....
也許，原因很簡單，亦即_____________________。
One of the premier causes is that(注意用詞)
最重要的原因之一便是______________。
At the risk of sounding too simplistic, it seems to me that the main propositions can be summarized in one saying.
這個原因可能較簡單，不過，我認為可以用一句諺語來概括，________。
We may look into every possible reason, however, foremost reason for .... Is ....
其實有很多原因，不過，造成________的最重要的原因是______________。
It might also be noted that....
需要注意的是，____________。
Another reason why .....(湊字數(shù)，但不可濫用) is that....(有利于寫長句)
What is also worth noticing is that....
值得一提的是___________________。
There is another factor that deserves some words here.
還有另外一個很重要的原因。
A more essential factor why.... Is that
________ 的更為重要的原因是____________。
A further reason why,,,, is that.....
________的更深層次的原因是____________。
In addition..此外，再者
Moving on to wider themes,_______
展開來說，_________________________。
The second thing that must be taken into consideration is that...
第二個原因也很重要(值得考慮)，亦即__________。
Likewise(同樣), common sense tells us that...
同樣，___________，這是眾所周知的。
The third but very important reason is that...
第三個(盡管不是很重要)原因是______________。
The third, not the last is that,
第三個原因是___________。
The last factor to be taken seriously is...
第三個重要原因是_______________。
Finally, moreover, last but not least, furthermore.
As the proverb goes: "every coin has its two sides", ....is no exception.
俗語有云："萬事萬物都有兩面性。" ________也不例外。
Every thing has a good side and a bad side, and ....is no exception.
萬事萬物有其兩面性，而________也是如此。
The discussion as to whether the ... is a blessing or a curse arouses most people's interests.
__________是好壞利弊問題引起了很多人的興趣。
..plays such an important role that it undeniably becomes the biggest concern of the present world.
______ 尤為重要而引起當今社會的關(guān)注。
