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____________。
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