negative causal link

例句：

1. 1. The study founda negative causal link between smoking and lung cancer.
   研究发现吸烟与肺癌之间存在负因果联系。
2. 2. The researcher proposed that the negative causal link between obesity and diabetes could be reversed by dietary changes.
   研究者提出，肥胖和糖尿病之间的负因果联系可以通过饮食改变来逆转。
3. 3. The results of this study suggest that there might be a negative causal link between stress and depression.
   这项研究的结果表明，压力和抑郁之间可能存在负因果联系。