①There are many reasons responsible for this phenomenon / case/ instance and the following are the typical ones.

② The 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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