causal

科学家们正在寻找导致这种疾病的因果因素。

Scientists are searching for the ___causal factors behind the disease.

这项研究揭示了吸烟与肺癌之间的因果关系。

The study revealed a ___causal link between smoking and lung cancer.

在实验中，我们必须区分相关性和因果性影响。

In experiments, we must distinguish correlational from ___causal effects.