investigation

英 [ɪnˌvestɪˈgeɪʃn] 美 [ɪnˌvɛstɪˈɡeʃən] ^[1] 

on-the-spot investigation實地考察

field investigation現場調查；現場試驗

experimental investigation試驗研究

under investigation在調查研究中

investigation report調查報告書 ^[1] 

1.This is why I have done the investigation for you.

這就是為什麼，我也做了調查，為你。

2.They incited him to go into further investigation.

他們鼓勵他進行進一步的調查。

3.But for the help of their group, we would not have succeeded in the investigation.

要不是因為他們的幫助，我們不會取得這次調查的成功。 ^[1]