Champagne or sparkling wine, whether sweet, semi-dry or absolutely dry; Whether it is white, red, pink or other colors; Whether it is high or low foam, the biggest difference from red wine is that there is gas in the bottle of this wine, which is greater than the air pressure outside the bottle. In order to prevent the bottle stopper from being pushed away by the gas in the bottle, an iron hoop made of metal wire is used to tightly hoop the bottle stopper on the bottle mouth. Whether it is sparkling wine or not can be judged by whether the cork has iron hoops. Of course, for beauty and romance, sparkling wine generally doesn't have to go straight up and down.