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
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,____________。
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