Hilly areas

• 丘陵山区

Hilly areas的用法和样例：

例句

1. The economic and social development level of these areas, to a certain extent, affects the process of building all Jiangsu into a better-off society.
   丘陵山区经济社会发展水平在相当程度上影响江苏全面建设更高水平小康社会的进程。