The degree of green bottle of snow beer indicates the concentration of wort, the raw material for beer production. The alcohol content of beer is directly proportional to the degree and grade of beer. The higher the degree and grade of beer, the higher the alcohol content. Generally, the alcohol content of first-class 9-degree beer is ≥3.8%, and that of first-class 8-degree beer is ≥2.8%. For example, be brave (bottle 8 degrees, 500 ml), pure (bottle 9 degrees) and refreshing (bottle 10 degrees, 650 ml).