溶洞

(geology) solutional cave (typically, a limestone cave)

róng = ru + (e)ng2

to dissolve / soluble

dòng = du + (e)ng4

cave / hole / zero (unambiguous spoken form when spelling out numbers) / CL:個|个[ge4]

溶洞 is not used as a component in another word.

溶洞 currently does not appear in any sentence.

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