question mark

1. N-COUNT A question mark is the punctuation mark ? which is used in writing at the end of a question. 问号

Who invented the question mark?

谁发明了问号？

2. N-COUNT If there is doubt or uncertainty about something, you can say that there is a question mark over it. 疑问; 不确定性

There are bound to be question marks over his future. 他的未来肯定会有很多问号。