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tie guan yin tea  is good drink to preventing heatstroke and keeping cool. According to Li Shizhen’s book “Compendium of Materia Medica”: tea tastes bitter and is cold, which can reduce pathogenic fire. In dog days of midsummer with the scorching sun hanging in the sky, you’ll feel cool with drinking a cup of cool or hot dragon well tea. That because the tea polyphenol , carbohydrate, amino acids, pectin and vitamins in tea will have a chemical reaction with the saliva in mouth, which can moisture mouth so as to make the function of thirst quencher. Meanwhile, due to the function of caffeine in tea, large of energy is sheded through pores. It is reported that the heat sheded from pores by drinking a cup of tea is as much as 50 times of that in the tea, so that people can feel cool.