hold an inquiry into a case

例句：

1. 1. The police are investigating the murder case.
   警方正在调查这起谋杀案。
2. 2.The scientist conducted a thorough investigation into the cause of the disease.
   科学家对这种疾病的原因进行了彻底的调查。
3. 3. The team is now in the process of investigating the missing person's whereabouts.
   该团队目前正在调查失踪人员的下落。