And I would like to present two explanations for this:

　　对于此，我有如下两点愚见：

　　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.

　　为什么___________，原因很多，在此列举几个较为重要的原因

　　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。

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