Why Is Water so Important?
为什么水对我们来说那么重要
Water is virtually（几乎） everywhere, from soil moisture and ice caps, to the cells inside our own bodies.
从土壤水分和冰盖，到我们体内的细胞，水几乎无处不在。
Depending on factors like location, fat index（脂肪指数）, age, and sex, the average human is between 55-60% water.
基于地理位置、脂肪指数、年龄和性别等因素，人类的平均含水量在55%到60%之间。
At birth, human babies are even wetter. Being 75% water, they are swimmingly similar to fish.
在出生时，人类婴儿甚至含水量更高。他们含水量在75%，就像鱼一样。
But their water composition drops to 65% by their first birthday.
但到了他们一岁的时候，含水量下降到65%。
So what role does water play in our bodies, and how much do we actually need to drink to stay healthy?
那么水在我们的身体里扮演了什么角色，我们到底需要喝多少水才能保持健康呢?
The H2O in our bodies works to cushion（缓冲） and lubricate（润滑） joints, regulate temperature, and to nourish the brain and spinal cord（脊髓）.
我们体内的水可以起到缓冲和润滑关节，调节温度，滋养大脑和脊髓的作用。
Water isn't only in our blood.
水不仅仅存在于我们的血液中。
An adult's brain and heart are almost three quarters water. That's roughly equivalent to the amount of moisture in a banana.
一个成年人的大脑和心脏几乎有四分之三是水。这大约相当于一根香蕉的水分含量。
Lungs are more similar to an apple at 83%. And even seemingly dry human bones are 31% water.
肺更像一个含水量为83%的苹果。即使看起来很干的人类骨头也有31%是水。
If we are essentially made of water, and surrounded by water, why do we still need to drink so much?
如果我们基本上是由水构成，被水包围着的，为什么我们还需要喝这么多水?
Well, each day we lose two to three liters through our sweat, urine（尿液）, and bowel movements, and even just from breathing.
嗯，每天我们都要通过汗液、尿液和排便，甚至是呼吸而损失2到3升的水。
While these functions are essential to our survival, we need to compensate for the fluid loss.
这些功能对我们的生存至关重要，所以我们需要弥补体液损失。
Maintaining a balanced water level is essential to avoid dehydration（脱水） or over-hydration, both of which can have devastating（毁灭性的） effects on overall health.
维持一个平衡的水位对于避免脱水和过度水合是至关重要的，这两种情况都会对整体健康造成毁灭性的影响。
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