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水是人体最主要的成分。人体内新陈代谢和体温调节都必须有水参加才能完成。水是构成人体组织细胞及血液、淋巴液、消化液、汗液、内分泌液、尿液等体液的基本成分,又是维持体液正常渗透压的必要条件。因此,人体的生理代谢活动没有水的参加就不能完成。婴幼儿对水的需求更为敏感,因为孩子体内含的水量占体重的比例要比成人大得多。
Water is the most important component of human body. Human metabolism and thermoregulation must be done with water. Water is the basic constituent of human body tissue cells and body fluids such as blood, lymph, digestive juice, sweat, endocrine fluid, urine and the like, and is a necessary condition for maintaining the normal osmotic pressure of body fluid. Therefore, the body’s physiological metabolic activity can not be completed without the participation of water. Infants and young children are more sensitive to water needs because the amount of water contained in the child’s body is much larger than that of adults.