Word: 洞 (dòng) 洞 dictionary entry dòng cave; hole; zero (unambiguous spoken form when spelling out numbers) Full dictionary entry for 洞 Example sentences using 洞 3 sentences, showing page 1 of 1. 他们正在挖一个洞。 Tāmen zhèngzài wā yí gè dòng. They're digging a hole. 他挖了一个洞。 Tā wāle yí gè dòng. He dug a hole. 这洞有多深啊？ Zhè dòng yǒu duō shēn a? How deep is the hole?