The basic rule is: if you allow someone to click on a link, you have to add an object to the browser history so the Back button will work as expected.
基本规则是：如果允许别人单击链接，就必须在浏览器历史中增加一个对象，以便后退按钮能够正常工作。
This algorithm considers the polygon vertex normal predigesting rule as a basic gist. On the precondition of assuring terrain effect, it can predigest models in large extent.
这种算法以多边形顶点法矢最简化准则为基本依据，能在保证地形视觉效果的前提下，对模型进行大幅度简化。
The sociology is the same as other courses which all have a research on an issue of basic rule.
社会学的基本规律是社会学学科理论建设的重要内容之一。
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