Three, follow the sequence and advance gradually, the dialogue want from the form and inside.

第三，循序渐进，对话要由表及里。

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Also combine all kinds of sell manner, pertinence, take it advance gradually. set up the sutra brand;

结合各种营销方式，有针对性，逐层推进。

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Based on the infinitely straight line, this thesis discusses the concepts of curve of second orders center, diameter, advance gradually in the line.

以无穷远直线为基础讨论二阶曲线的中心、直径、渐近线等几个仿射概念，并联系解析几何中的有关性质，深入讨论它们之间的一致性。

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