Characters

• 牢 (牢): firm; sturdy; fold (for animals); sacrifice; prison
• 固 (固): hard; strong; solid; sure; assuredly; undoubtedly; of course; indeed; admittedly

Resources

• Wiktionary: 牢固
• MDBG: 牢固
• Examples with 牢固 on Tatoeba

Examples

绳子不够牢固，撑不住他。

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