Da Li and Xiao Wang are editors of the news department of a newspaper  The editor-in-chief of the newspaper plans to transfer staff from the Department of Public Information to the Ministry of Economic Affairs  The editor-in-chief decided that they would not be transferred without the consent of Da Li and Xiao Wang himself  Da Li told the editor-in-chief:I don't agree with the transfer unless I know whether Xiao Wang has been transferred or not
Xiao Wang said: unless I know whether Da Li has been transferred, I will not agree to the transfer
Either both of them will be transferred, or neither of them will be transferred.