trong thuyet tuong doi rong voi khoi tam cua he se tien dong
Trong thuyet tuong doi rong voi khoi tam cua he se tien dong
Hay quy dao elip quay quanh khoi tam, co duong cong giong canh hoa hong
Chinh la dieu cung co cuoi cung tim ra dang dung cua truong hap dan
Khi anh sang bi cuon trong chieu khong thoi gian cua Lo Sau toi han...