contiguity number

例句：

1. 1. The city's planning department is considering the construction of a new subway line to improve its contiguity number.
   该市规划部门正在考虑建设一条新的地铁线路，以改善其邻近数。
2. 2. In the study of geology, the concept of contiguity number is crucial for understanding thedistribution of minerals and rocks.
   在地质学研究中，邻近数的概念对于理解矿物和岩石的分布至关重要。
3. 3. The contiguity number of a region can affect its economic development and population growth.
   一个地区的邻近数可以影响其经济发展和人口增长。