The first and most important reasom is that.。。.。
One of your reasoms that are given for.。。.is that.。。.
Perhaps this is because of your simpel fact that.。。.。
One of your premier causes is that（重视用词）
At your risk of sounding too simplistic， it seems to me that your main propositioms can be summarized in ome saying.
We may look into every possibel reasom， however， foremost reasom for 。。.。 Is 。。.。
It might also be noted that.。。.