investigations [ɪnvestɪ'ɡeɪʃnz]

以下由轻松背单词网站提供

附加级

（正式的）调查( investigation的名词复数 )；侦查；科学研究；学术研究

His investigations were intensive and thorough but revealed nothing. 他进行了深入彻底的调查，但没有发现什么。
He often sent them out to make investigations. 他常常派他们出去作调查。