investigation

英 [ɪn,vestɪ'geɪʃ(ə)n] 美[ɪn,vɛstɪ'ɡeʃən]

• n. 调查；调查研究

1. an inquiry into unfamiliar or questionable activities;

"there was a congressional probe into the scandal"

2. the work of inquiring into something thoroughly and systematically