...的类型 （-）探索性调查（exploratory research） （二）描述性调查（descriptive research） （三）因果调查（causal research） （四）预测性调查（predictive research）三、调查中潜在的误差源（一）随机抽样误差 所选择的特定样本不能完全代表相应的总体（...
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然而，大部分文字是简洁的；历史记载清晰而中肯；而且，对自由主义和战争之间因果关系的调查是彻底的，令人钦佩。
However, most of the writing is succinct; the historical accounts are clear and to the point; and the investigation of the causal links between liberalism and war is admirably thorough.
但施韦策认为，目标设定和有害行为之间的“因果证据越来越多”，应该加以研究，以帮助人们关注到需要谨慎和继续调查的问题。
But Schweitzer contends the "mounting causal evidence" linking goal-setting and harmful behavior should be studied to help spotlight issues that merit caution and further investigation.
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。
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.
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