主权是安全界定的标尺、方向和范畴，安全是维护主权的手段、途径和屏障。

Sovereignty is the scale, direction and category of security definition, security is the means, way and barrier to safeguard sovereignty.

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第一步是尽可能精确地界定股票风险溢价的范畴。

The first step is to define the equity risk premium more exactly.

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引言部分，旨在界定质疑与投诉制度的基本范畴，显现对其加以研究的立法背景、理论价值以及实践意义。

In the Preface, it aims to define the basic categories of the challenge and complaint system, presenting the legislative background, theoretic value and practice importance of studying them.

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Now people are beginning to question whether this should define what a food is.

有人就要质疑了,这到底能不能界定食物的范畴呢

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选