12345678910111213141516Keywordcavitymine shaftholeFrequency#4552Strokes16ReadingslóngMnemonic穴 (hole) gives the meaning and 隆 the sound.Stroke orderComposed of穴cave隆prosperousUsed in vocabulary窟窿kūlonghole; pocket; cavity; loophole; debt穹窿qiónglónga dome; a vault; the sky大耳窿dà'ěrlóngloan shark; usurer窿lóngcavity; hole