为准确获取该变化在公交网络中的具体范围及程度，本文首先结合公交出行特性，获取公交网络拓扑结构。

汉语读来很别扭，还是我语文没学好？只好将就着翻了
In order to get the detailed range and extent of that change in the public transit network accurately, the first step of this paper is to acquire the topoligical structure of the the public transit network in association with the features of the public use of the network

公交出行太小，不宜使用travel或别的什么，

建议the first step of this paper is to...改为the first step of this paper was to...

建议the first step of this paper is to...改为the first step of this paper was to...