溶洞

róngdòng

limestone cave

* * *

rong2 dong4

karst cave

* * *

溶洞

róng dòng

{地质} karst cave:

桂林有溶洞。 There are karst caves in Guilin.

* * *

溶洞|溶洞 [róng dòng] ► karst cave