??????????? ??? ??????????????? ???????? ????? ????????! ????????? ????? ?? ???????? ??????????? ????? , ????? ???????? , ??? ????????? ??? ??????? ??????? ???????? ????????? : du l?ch ???????? ????? ???????? là ?????? ??? tuy?t ??p ?????? v?i môi tr??ng ????? . b?n có th? ???????? {??????? ??????? ?????? ví d? nh?ng ???????????? ??i ???