The author has referred to a lot of literature at all times and in all over the world and makes a detailed exposition.
本文首先对选题的背景做了介绍，查阅了古今中外大量的文献，并进行了详细的论述。
First of all, Professor Li introduced to the audience some famous universities at all times and in all over the world, and the history of BNU and our beautiful campus.
首先，李春秋教授列举了古今中外的一些大学，以此引出北师大的渊源和我们美丽的校园。
This paper summarizes and classifies the urban road network at all times and in all over the world from the view of morphologic, analyzing the applicable conditions of each mode of road network.
本文从形态学的角度对古今中外的城市路网模式进行了分类与总结，并对每种路网模式的适用条件进行了分析。
This paper summarizes and classifies the urban road network at all times and in all over the world from the view of morphologic, analyzing the applicable conditions of each mode of road network.
本文从形态学的角度对古今中外的城市路网模式进行了分类与总结，并对每种路网模式的适用条件进行了分析。
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