???????????? ??????? ???????????? ??? ??????? ?? ?? ???? ???? ???? ???????? ?? ???? ???????????? ??·????? ???????????????? ?? ???????????? ?????????? ?? ???????? ???????????????????? ??? ?? ???? ???? ????????? (?????)?? ???? ?? ???????? ???? ???????????????????????????? ??????.In this lesson, you might find out about the term ??, which can be an