??? ???? ???? ?Z ????α? ???? ? ?????? ??????? ???
?¶??ν??? ??????. 2020?? ?????? ??????? ????? ???? ??????
????? ??????????? ??????? ??????? ???? ???? ??????. ?????? ????? ??γ????????
?????????? ??γ?19 ??????? ??? ??????? ??????? ???? ?????. 1?? ???? ??
????????????? ??????(??γ?19) ???? ???ξ?? ?????? ???????. ?