For example, medicine is the most typical causal research, know the pathology, etiology, you can develop the appropriate drugs.

例如，医学是最典型的因果关系研究，知道病理、病因，就可以研发相应的药品。

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While observation and focus groups are best suited for exploratory research, surveys are best suited for descriptive research and experiment for causal research.

观察法和专题讨论法适用于探索性调研，问卷调查法适用于描述性调研，而实验法适用于因果性调研。

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Further research is needed to investigate the causal nature of this relationship, and to look at how owners' personalities are directly influencing their pets' behaviour and wellbeing.

需要进一步的研究来调查这种关系的因果本质，并调查主人的个性是如何直接影响他们的宠物的行为和健康的。

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With both depression and suicide, research suggests that causal factors are a combination of genetics and environment, Peterson said.

CNN: Suicidal behavior may run in families

Despite findings in recent research studies that conclusively refute the causal link between violence in video games and aggression in children, the speculation about such a causal link continues in the political sphere.

FORBES: Senator Rockefeller Quotes Experience, Believes That Evidence Proves Violent Movies and Games Cause Aggressive Behavior in Kids

Because these studies are mainly observational, extensive research is under way to determine the causal relationship between vitamin D levels and disease as well as the role of increasing vitamin D intake.

CNN: How much vitamin D do I need?