破案 pò’àn to solve a criminal case
How to remember 破案: 破 broken + 案 file = to solve a criminal case.
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How it is used
- To crack / solve a criminal case - 警方很快破了案 (jǐngfāng hěn kuài pò le àn) the police cracked the case quickly.
- A verb-object phrase (破了案), so it splits. Specifically about solving crimes, not general problems (that is 解决).