但是，没有理论能够证明二者之间的因果关系。
But there is little academically accepted evidence of a causal relationship.
传统理论研究关注的是因果关系的界定及其判断，对于因果关系本身的机能研究欠缺。
The traditional fundamental research is more concerned about its definition and judgment than its functions.
第一章为因果关系理论分析。
第一章为因果关系理论分析。
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