retrieval
/rɪˈtriːvəl/noun
mass noun
1- the process of getting something back from somewhere收回, 找回：
the investigation was completed after the retrieval of plane wreckage.
在找回失事飞机残骸后调查宣告结束。
1.1
- the obtaining or consulting of material stored in a computer system（计算机系统中存储资料的）检索。