in the midst of sth/of doing sth
while sth is happening or being done; while you are doing sth 当某事发生时；在某人做某事时
a country in the midst of a recession
处于衰退中的国家
She discovered it in the midst of sorting out her father’s things.
她在整理父亲的东西时发现了它。
in their/our/its/your midst
(formal) among or with them/us/it/you 在（他们、我们、你们）中间；和…一起
There is a traitor in our midst.
我们中间有个叛徒。