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water is the basic source of life. there would be no life without water.
more and more water is needed in the modern society.
many places are short of water; many rivers and lakes are polluted. what is worse, many people are wasting water.
in order to protect water, let is do something to fight against all kinds of pollution and waste of water.
我们的生活离不开水，水给人类、动物、植物带来了好处。
we can't live without water, which brings benefits to human beings, animals and plants.
水可以给人们解渴，还可以使我们的房间、教室、商场变得干净。大量喝水还有降温、降血脂、通便、减肥的作用。
water can quench people's thirst and make our rooms, classrooms and shopping malls clean. drinking a lot of water can also cool down, reduce blood fat, relieve constipation and lose weight.
动物的生长离不开水，有些在水里生活的动物更离不开水，比如有：小鱼、海豚、鲨鱼等，它们在水里找食物，自由自在地游玩。
the growth of animals can not be separated from water, and some animals living in the water can not be separated from water, such as: small fish, dolphins, sharks, etc. they look for food in the water and play freely.
有了水小草长得碧绿，树木长得高大，田里的庄稼才可以丰收。
with water and grass growing green, trees growing tall, the crops in the field can harvest.
水的'作用还有很多，总之，有水才有我们的一切。
there are many functions of water. in a word, only with water can we have everything.
积雪，好象一条奇妙的地毯，铺盖在大地上，使地面温度不致因冬季的严寒而降得太低。积雪的这种保温作用，是和它本身的特性分不开的。
我们都知道，冬天穿棉袄很暖和，穿棉袄为什么暖和呢？这是因为棉花的孔隙度很高，棉花孔隙里充填着许多空气，空气的导热性能很差，这层空气阻止了人体的热量向外扩散。覆盖在地球胸膛上的积雪很象棉花，雪花之间的孔隙度很高，就是钻进积雪孔隙里的这层空气，保护了地面温度不会降得很低。当然，积雪的保温功能是随着它的密度而随时在变化着的。这很象穿着新棉袄特别暖和，旧棉袄就不太暖和的情况一样。新雪的密度低，贮藏在里面的空气就多，保温作用就显得特别强。老雪呢，象旧棉袄似的，密度高，贮藏在里面的空气少，保温作用就弱了。
为什么物体里贮藏的空气越多，保温效果越强呢？
这是因为空气是不良导体的缘故。我们知道，任何一个物体，它本身都能通过热量，这种能够通过热量的性能，称做物体的导热性。在自然界常见的几种物质中，空气的导热性最差。所以物体里容纳的空气越多，它的导热性就越差。由于积雪里所能容纳的空气量变化幅度较大，因此，积雪的导热系数变化幅度也较大。一般刚下的新雪孔隙大，保温效应最好，到春天融雪后期，积雪为水所浸渍，这时它的导热系数就更接近于水了，积雪的保温作用便趋于消失。
这就是雪的保温作用。
all plants and animals need water.we also need water.water is neened on farms,in schools and factories.water is very important for living things.none and nothing can live without water.everbody knows this,but not all of us save the water.for example,someone doesnt turn off the tap after washing.although they know water is very important,but they dont know the more water we use,the less water is.
lets save the water together from now on.
as we all know, with the rapid development of population, people need less and less water resources.
at present, china is already one of the few water scarce countries in the world, but there's still a lot of water wasting around us. for example, in the bathroom, the water cage is often open, the students after washing hands are not forgotten to shut the water cage, is the water cage closed, causing a lot of water white flow out. i want to know how much green water can be irrigated by these wasted tap water. how many deserts can make oasis?
today, the school has carried out activities to save water, so that we know that without water, there will be no life. groundwater is limited, and it is not inexhaustible. so the students have taken action, especially when drinking pure water, the students do not waste, they used to pour the bottle full and sprinkled the place when they poured water. since the water saving activities were carried out, the students drank a lot and no longer saw the waste of water. our class needed three barrels of pure water a week, and now we have two barrels per week.
many of us have come up with lots of ways to save water. for example: washing rice water can wash vegetables, fish water can be watered, washing water can wash toilets, scrub floors, we also suggest the principal room to the school toilet every five minutes automatically rinse the toilet water tank into a hand type water tank... we not only put these ideas into practical action, but also drove everyone around us. imagine that if every one of us saves a glass of water a day, the water saved by the people of the world can converge into a running river every day... it will make our living environment more beautiful. "don't let the last drop of water on earth become human tears!" this is not alarmist, saving is the traditional virtue of the chinese nation. let's act quickly and carry forward this virtue.
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