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。
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。
The coal enterprises should seize the prosperous opportunity of coal industry to advance gradually the business transformation into practice at as early time as possible.
我国煤炭企业应抓住煤业繁荣的良好机遇，及早开始实施渐进式转型。
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