??(??)?? ????????????, ???????????? ???? '?? ????'???? ??, ?? ?????????? ???????????????? ?????? ???? ????????.  ?????????? ???? ?????????? ??? ?? ???????????? ??????????? ?????? ?? ?????? ?????? ???????? ???? ????, ?? ?? ???????????????????? ?????? ?? ????.With this lesson, you may find out about the term ??, and that is an abbreviation on the w