立案lì’ànto file a case; to register officially (for investigation)HSK 7-9Pronunciationlì’ànExample sentence警方已对这次事故立案调查。jǐngchá yǐ duì zhè cì shìgù lì'àn diàocháThe police have officially filed a case to investigate the incident.Read and choose an answerOne fixed sampleExplore a sample