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人天天都在喝水,但是为什么要喝水,许多人却知之甚少。水是构成一切生物体的基本成份。不论是动物还是植物,均以水维持最基本的生命活动。人可数天无食,不可一天无水,所以,水是生命之源泉,水也是人类最必需的营养素之一。人的体重约50%～70%是水分。含水量随年龄、性别及身体状况的不同而异。脑组织大约含85%的水,血液大约含
People drink water every day, but many people do not know much about why they drink water. Water is the basic ingredient that makes up all living things. Whether animal or plant, water is used to maintain the most basic life activities. People can eat for a few days without water, so water is the source of life, water is also one of the most essential nutrients of mankind. About 50% to 70% of human body weight is water. Water content varies according to age, sex and physical condition. About 85% of brain tissue contains water, blood contains about