investigate

1.[i][t]调查，侦查（某事）to carefully examine the facts of a situation, an event, a crime, etc. to find out the truth about it or how it happened

2.[t]~ sb (for sth)调查（某人）to try to find out information about sb's character, activities, etc.

3.[t][i]研究；调查to find out information and facts about a subject or problem by study or research

1.研究,调查;审查

2.研究,调查

1.to try to find out the facts about something in order to learn the truth about it; to try to get detailed facts and information about a person’s behavior or character