六级The studies also ran up against many methodological challenges, the biggest of which centered on the old statistical saying, "Correlation does not equal causation."

这些研究还遇到了许多方法上的挑战，其中最大的挑战集中在古老的统计谚语“相关性不等于因果关系”上

2018年12月六级真题（第一套）听力 Section C