用karst spring造句子，“karst spring”造句

3、Karst caves, subterranean streams and karst springs also are other important valuable kinds of tourism resources.

1、Describes the present state of Liulin karst spring and puts forward some opinions about its development, utilization, and protection.

2、The groundwater system of karst spring is a nonlinear and dynamic system influenced by factors such as hydrology, geology, landform, vegetation and human's activities.