The link between smoking and cancer, for example, was seen in many observational studies, but forcing subjects to smoke for years to prove it would be untenable.
拿吸烟和肺癌之间关系的研究来说，许多观察性研究都发现了这一点，但要迫使研究对象吸烟多年来证明这一点恐怕是不可能的。
The fourth part makes clear the research instrument and subjects, explains the research procedure and analyzes the mutual relationship of every research link.
第四部分明确了研究工具和被试，阐释了研究过程，并对各研究环节的相关关系进行了分析。
In a separate study, to test the link between physical temperature and emotional state, scientists had subjects hold cold and hot packs and recorded levels of perceived loneliness.
在另一项研究中，为测试人体体温与情绪状态之间的关系，科学家让受试人员人别抱着冷敷包和热敷包，并记录下感知到的孤独程度。
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