2015考研英语作文 原因阐释类万能句型

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　　原因阐释段
　　【示例一】
　　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。