Huódòng jǔbàn qián, zhǔbànfāng zhìdìng le xiángxì de ānquán yùàn.
Before the event, the organizers drew up a detailed safety contingency plan.
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usage
预案 is a formal/administrative term common in government documents, emergency management, and project planning. It refers specifically to a plan prepared in advance for anticipated scenarios, especially emergencies.
