公约 gōngyuē convention (i.e. international agreement)
How to remember 公约: 公 public + 约 make an appointment = convention (i.e. international agreement).
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How it is used
- An international 'convention/covenant' - a formal multilateral agreement: 日内瓦公约 (Rìnèiwǎ gōngyuē) the Geneva Conventions.
- Also a code of collective conduct agreed within a community: 文明公约 (wénmíng gōngyuē) a civic pledge. Formal/legal register.