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Stroke order
牢固 is written in 15 strokes across 2 characters.

- 牢 — 7 strokes
- 固 — 8 strokes
Senses
- firm
- secure
Characters in 牢固
- 牢 láo — (literary) pen; fold (for livestock); prison; jail; firm; secure; fast
- 固 gù — hard; strong; solid
Character meanings from CC-CEDICT (CC BY-SA 4.0).
Related words
牢固 is pronounced láogù and means “solid”.