on [upon] investigation

• 经过调查

on [upon] investigation的用法和样例：

例句

1. Some problems must be solved step by step,through investigation and study.
   有些问题要经过调查研究，逐步解决。
2. Three squadrons of criminal investigation after investigation found that thieves used crowbars to break open the iron gate of burglary crime.
   刑侦三中队经过调查后发现窃贼均使用撬棍撬开铁门入室盗窃作案。