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.
以下这些是造成这一问题的最主要/最好/最重要/最大/最有意义/明显/至关重要的原因。
This is based on the propensity(倾向，原因) of following points.
这基于以下的原因。
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.
第一个原因其实很明显。
The first and most important reason is that.....
第一个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.....
也许，原因很简单，亦即_____________________。
One of the premier causes is that(注意用词)
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.
这个原因可能较简单，不过，我认为可以用一句谚语来概括，________。
We may look into every possible reason, however, foremost reason for .... Is ....
其实有很多原因，不过，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 .....(凑字数，但不可滥用) is that....(有利于写长句)
What is also worth noticing is that....
值得一提的是___________________。
There is another factor that deserves some words here.
还有另外一个很重要的原因。
A more essential factor why.... Is that
________ 的更为重要的原因是____________。
A further reason why,,,, is that.....
________的更深层次的原因是____________。
In addition..此外，再者
Moving on to wider themes,_______
展开来说，_________________________。
The second thing that must be taken into consideration is that...
第二个原因也很重要(值得考虑)，亦即__________。
Likewise(同样), common sense tells us that...
同样，___________，这是众所周知的。
The third but very important reason is that...
第三个(尽管不是很重要)原因是______________。
The third, not the last is that,
第三个原因是___________。
The last factor to be taken seriously is...
第三个重要原因是_______________。
Finally, moreover, last but not least, furthermore.
As the proverb goes: "every coin has its two sides", ....is no exception.
俗语有云："万事万物都有两面性。" ________也不例外。
Every thing has a good side and a bad side, and ....is no exception.
万事万物有其两面性，而________也是如此。
The discussion as to whether the ... is a blessing or a curse arouses most people's interests.
__________是好坏利弊问题引起了很多人的兴趣。
..plays such an important role that it undeniably becomes the biggest concern of the present world.
______ 尤为重要而引起当今社会的关注。
There comes a question: is it a blessing or a curse.
问题是：____是福是祸?
There is no denying that every thing has one more face and ... is no exception.
不可否认，每一件事物都有其两面性，其实，______也不例外。
Every thing in the world has its own two sides. Without exception, A has both advantages and disadvantages.
任何事情都有两面性，A也不例外，有其优势和劣势(利与弊)。
....undoubtedly plays an increasing significant role in modern life.
不容置疑，_______在现代生活中不断显示出起重要性。
With the development of the society, ... is increasingly important.
随着社会的发展，_______变得越来越重要。
The merits of this is obvious...
其好处显而易见。
As we know, ... bring many benefits and convenience to people.
众所周知，_______ 为我们的生活带来很多好处。
There are no less than three advantages in .. as rendered below. liuxuepaper.com
如下所示，_______ 至少有三种好处。
Despite the advantages ... has, some people claim, we shall not lose sight of its adverse effects on...
尽管_____有些益处(优势)，有些人则认为，我们不能忽略了其对______的负面影响。
However, like anything else,... has more than one face.
然而，象其他任何事物一样，______ 还有其它的方面。
However, with the advance of the human civilization, there is an increasing number of people who have raised doubts about whether...
然而，随着人类文明的进步，越来越多的人开始置疑是否__________。
小编建议：英语作文