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The principium of this tea bag is sketching the contours of leaf vien in the label by absorbing tea water into it through a bibulous string tied on the tea bag. The integrity of the contours of leaf vien represents the temperature of the tea water. When the contours of leaf vien are completely sketched on the label, it means the temperature of the tea water reaches 55 degrees Celsius to 65 degrees Celsius, the most suitable temperature for drinking.