【示例一】

　　①there are many reasons responsible for this phenomenon/case/instance and the following are the typical ones. ②the first reason is that  ________（理由一）. ③the second reason is that ________（理由二）. ④the third reason is that/a case in point is that/the typical example is that ________（理由三）.

　　【示例二】

　　①there are many reasons to explain/explaining the effect/phenomenon/case/instance. ②the most contributing one is/the main reason is no other than  ________（理由一）. ③what is more, ________（理由二）. ④ ________（理由三）also play a role in this case.
 

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