水是生命之源。一切生命都需要水,没有了它,生命就不复存在。世界上有许多国家、地区水资源极为匮乏。我国的西北、华北地区也极为缺水。造成许多地区缺水的原因之一是过度砍伐树木。众所周知,森林是涵养水源的宝库。雨水降落时,树木通过根系把水吸收到自己的身体里。等到天气干旱时,树木通过蒸腾作用把水分散发到空气中,形成降水。另外一个原因是许多人不知道节约用水。 Water is the source of life. All life needs water, without it, life no longer exists. There are many countries in the world, where water resources are extremely scarce. Northwest China, North China is also extremely short of water. One of the causes of water shortages in many areas is over-cutting of trees. As we all know, the forest is a treasure house of water. When rain falls, the trees absorb water into their bodies through the root system. When the weather is arid, the trees distribute the water to the air through transpiration to create precipitation. Another reason is that many people do not know how to save water.