HSK 7-9
立案
lì’àn动
to register (to an official organism); to file a case (for investigation)
警方已经正式立案调查。
Jǐngfāng yǐjīng zhèngshì lì'àn diàochá.
The police have formally opened an investigation.
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Appears across levels (7-9) in the HSK 3.0 word list.