At transonic speeds (close to the speed of seem), it can help to sweep the wing backwards or forwards to cut back drag from supersonic shock waves as they start to form. The swept wing is just a straight wing swept backwards or forwards.???? - ???? ????? ???? ????? ?????? ?? ?? ???? ??? ????? ????? ?? ?? ??? ?? ???? ??? ???? ????? (???) ????? ?????