???? ??? ??????? ??? ??? ???? ???? ?????? ?????? ????? ???? ?????? ???? ????? ???? ?? ???? ????? ?????.??? ?????? ????????? ????????? ?????? ???? ???? ?????? ????? ??? ?????? ???????? ?????????? ????? ?????? ???? ?? ???? ????????? ???? ??? ?????? ?????? ?????? ???????? ???????? ?????? ??????? ???????.Once the fundamental cause is diagnosed, it can