腹地

例句：

1. 1. The company's headquarters are located in the heartof the city.
   该公司的总部位于市中心。
2. 2.The research was conducted in the rural areasof the country.
   这项研究是在该国农村地区进行的。
3. 3. The new project will expand intothe undeveloped regions of the country.
   这个新项目将扩展到该国未开发的地区。