inquire into something
phrasal verb with inquire verb [ I or T ] (UK also enquire) uk/ɪnˈkwaɪər/ us/ɪnˈkwaɪr/
formal (UK also enquire into something)
调查，查究;查问
to try to discover the facts about something
When the authorities inquired into his background, they found he had a criminal record. 当局调查他的背景时，发现他有犯罪前科。