调查的近义词、同义词

conduct an inquiry or investigation of; "The district attorney's office investigated reports of possible irregularities"; "inquire into the disappearance of the rich old lady"

question or examine thoroughly and closely

trace; "We are running down a few tips"

observe, check out, and look over carefully or inspect; "The customs agent examined the baggage"; "I must see your passport before you can enter the country"

an inquiry into unfamiliar or questionable activities; "there was a congressional probe into the scandal"