There's a secondary fermentation, that happens inside the bottle.

瓶子里会进行二次发酵。

Champagne can only be made through the secondary fermentation that happens in the bottle.

香槟只能通过瓶子里发生的二次发酵来制造。

In carbonated alcoholic beverages, like champagne and beer, sealed containers are used in primary or secondary fermentation to keep the carbon dioxide in the bottle.

那些碳酸酒精饮料， 如香槟和啤酒，在初次或二次发酵时， 将被密封储存，来把二氧化碳留在瓶子里。