not simply connected region

例句：

1. 1.The region is not simply connected, which makes it difficult to map accurately.
   这个区域不是简单的连通的，这使得准确地绘制地图变得困难。
2. 2. Due to the non-simple connectivity of the network, we need to redesign the data structure.
   由于网络的非简单连通性，我们需要重新设计数据结构。
3. 3. The study of this region is crucial for understanding the dynamics of complex systems.
   研究这个区域对于理解复杂系统的动力至关重要。