In the preface, the writer discusses the significance and the current situation of studying the topic, points out the aim of writing the paper.

在前言部分，作者提出了研究这一课题的意义、研究现状，点明了本文的主要写作目的。

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Firstly, the writer expounds the meaning of "pure" and argues about what the aim of pure theory is.

首先，作者解释了“纯”的含义，以及凯尔逊提出“纯粹法”理论的目的。

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Hence, the writer proposes that moral education should aim at a detailed analysis and a proper use of the virtue evaluation results, and a static-dynamic model evaluation.

德育实践呼吁对思想品德测评的内容要进行细化分析并创建动静态相结合的测评模式，同时恰当使用测评结果。

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Gould, a Harvard paleontologist and a popular-science writer, who died in 2002, was taking aim mainly at the rising ambitions of sociobiology.

NEWYORKER: It Ain��t Necessarily So