investigatorn.
英 ɪn'vestɪgeɪtə(r) | 美 ɪn'vɛstɪɡetɚ
中文n. 研究者；调查者；侦查员
词根词源
investigator (n.)1550s, a native agent-noun formation from investigate, or else from Latin investigator "he that searches into," agent noun from past participle stem of investigare (see investigation).
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