短語詞組用作動詞 (v.)～+名詞investigate the causes of 調(diào)查…的原因～+副詞investigate rigidly 嚴(yán)密地調(diào)查investigate thoroughly 徹底調(diào)查～+介詞investigate at first hand 直接調(diào)查investigate into an affair 調(diào)查一件事短語 返回 investigates