增长级布局模式、点轴布局模式、圈层布局模式是区域旅游业空间布局的基本模式。

The growth-level model, point-axis model, circle-layer model are the fundamental models for the spatial layout of regional tourism layout.

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文章在对西部铁路项目进行定量模型分析的基础上，利用点轴理论、增长极原理以及相关区域经济理论对社会效益进行定性分析。

In this paper, a quantitative model of the railway project based on the analysis, using the point-axis theory, growth pole theory and regional economic theory to analyze social benefits qualitatively.

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村镇体系在理论上为区域中心镇、一般乡镇、中心村、基层村的等级结构形式，其空间布局以点轴模式、中心地模式和散点模式最为常见。

Theoretically, village-town system is a sort of hierarchical structure, consisting of central regional town, general agricultural town, central village and basic village.

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Square root of 16, and my plot basically shows it crosses at 4 and-- well, I think that's minus 4.

我的图清楚的显示这个函数,在4和-4两个点和x轴交合。

麻省理工公开课 - 计算机科学及编程导论课程节选

Yeah. Suppose I choose it right down there I guess 0. Well, the tangent there will not even have an x intercept. So I'm really going to be dead in the water.

好，如果我选猜想数为0，好吧,这个点的切线甚至和x轴都没交点,所以在这儿这一原则,真的不起作用了。

麻省理工公开课 - 计算机科学及编程导论课程节选

That's a choice, and that choice turns out to be very interesting and really important, because if you connect these two points together, you get a straight line that has to intercept the x-axis at some point.

在这一选择下,我们会发现一件非常有趣，而且极其重要的事,当你把这两点用直线连接起来，你会发现这条直线,将与x轴在某点相交。

麻省理工公开课 - 热力学与动力学课程节选