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When drinking hot beverage by using the tubularis,people always
get scalded.So we design SLOW DOWN to solve the problem.
Before you drink the hot beverage the tubularis just looks like an ordinary
tubularis.When you start to drink,the tubularis will swell because of the
high temperture.Swelling will compress the tubularis and make it thinner,
so you can only drink a little.It will protect you from empeyrosis.