S? c? b?o trì: Sân ch?i c?ng có th? th?c hi?n b?o trì h? th?ng ?? c?i thi?n ch?t l??ng d?ch v?, nâng cao tr?i nghi?m ng??i dùng.A debit to at least one account might be balanced by more than one credit history to other accounts, and vice versa. For all transactions, the entire debits needs to be equal to the total credits and so harmony.B??c