a question mark hang over something

US /ə ˈkwes.tʃən mɑːrk hæŋ ˈoʊ.vər ˈsʌm.θɪŋ/
UK /ə ˈkwes.tʃən mɑːrk hæŋ ˈoʊ.vər ˈsʌm.θɪŋ/
"a question mark hang over something" picture
1.

懸而未決, 存在疑問

a feeling of doubt or uncertainty about something

:
A question mark hangs over the future of the company.
公司的未來懸而未決
His involvement in the scandal still has a question mark hanging over it.
他是否捲入醜聞仍懸而未決