答案應該是“two-day's”或者“two days'”
如果用了連字符,那麽day要用單數,變成two-day;轉換成所有格時,直接加“'s”,變成“two-day's”
如果不用連字符,那麽day要用復數,變成two days;由於末尾已經有了s,轉換成所有格時,只要加“'”,變式 two days'