Why is the champagne glasses so long
First you need to understand the uses of champagne glasses, if you know the purpose of Champagne Cup you will know why champagne would be so long,
champagne is usually used in general wedding ceremony and celebration, on these occasions are all free to walk through search in the crowd, looking for someone to chat, talk, glasses if the reception is very short, the cup body easily spilled, get someone else's clothes, so the cup body will do so long the champagne is in order to avoid this from happening, avoid embarrassing things happen to the party activities.
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