As for the water temperature, China people prefer to be warm, not the hotter the better. Because the delicacy of food is mostly related to temperature, China people have a soft spot for hot food. This can be traced back to 20 thousand years ago. Pottery made by the ancients was used for cooking and boiling water. At the same time, boiling water can also effectively inhibit bacteria. In that era of poor sanitation, the habit of drinking hot water gradually formed. However, modern research believes that drinking water is not as hot as possible. Excessive water temperature will burn the digestive tract mucosa. It is more appropriate to use warm water of 34~38℃, and the water temperature should not exceed 60℃ as far as possible. In addition, many young people are not unable to learn the western habit of drinking cold water and ice water, but our stomach acceptance is not high, which is easy to cause stomach discomfort and induce diseases.