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. hxw.red

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__________。

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