Safe vent hole - the double wall glass has a pinhead-sized hole somewhere in the glass. These holes will not let water/steam/condensation water enter, which can well reduce the glass bursting during use. water and air can only be expelled, not entered....
Safe vent hole - the double wall glass has a pinhead-sized hole somewhere in the glass. These holes will not let water/steam/condensation water enter, which can well reduce the glass bursting during use. water and air can only be expelled, not entered....
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