you never know (with sb/sth)是什么意思

词组 you never know (with sb/sth) 释义 ●you never know (with sb/sth)you cannot be sure (about the behaviour of sb/sth or the quality of sth) 很难说；很难预料◆Don’t throw away those old stamps. You never know, they might be valuable one day.别把那些旧邮...