Some problems must be solved step by step,through investigation and study. 有些問題要經過調查研究，逐步解決。
Three squadrons of criminal investigation after investigation found that thieves used crowbars to break open the iron gate of burglary crime. 刑偵三中隊經過調查后發現竊賊均使用撬棍撬開鐵門入室盜竊作案。
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