There are at least two good reasons accounting for __這里至少有兩個原因可以對_ X X 作出解釋__. On the one hand, _一方面_____. On the other hand, ______ is due to the fact that ________. 另一方面---的原因是。。。In addition, 而且_______ is responsible for _______. Maybe there are some other reasons to show _也許有其他原因要展示_______. But it is generally believed that the above mentioned reasons are commonly convincing. As far as I am concerned, I hold the point of view that _______. I am sure my opinion is both sound and well-grounded.