thorough investigation

• 彻底调查

thorough investigation的用法和样例：

例句

1. The superintendent ordered a thorough investigation of the case.
   警长命令对这一案件作彻底调查。
2. I am pleased to report that the various committees are now working in unison to thoroughly investigate this matter.
   我很高兴地告诉大家，各委员会正在一致行动，彻底调查这件事。