【示例一】

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