英语翻译Trees are useful to man in three important ways:they pro

英语翻译
Trees are useful to man in three important ways:they provide him with wood and other products,they give him shade and they help to prevent drought(旱灾) and flood.
Unfortunately,in many parts of the world,man has not realized that the third of these serious facts is the most important.In his eagerness to make money from trees,he has cut them down in large numbers.And besides,he is usually too careless to plant and look after young trees.So the forests slowly disappear.
This doesn't only mean that man will have fewer trees.The results are even more serious,for where there are trees,their roots break up soil—allowing the rain to sink in and also bind(固定) the soil,thus preventing it from being washed away easily; but where there are no trees,the rain falls on hard ground and flows away,causing floods and carrying away the rich top soil.When all the top soil is gone,nothing remains but worthless desert.
Two thousand years ago a rich and powerful country cut down its trees to build warships,with which to gain itself an empire.It set up the empire but,without its trees,its soil became poor and it grew weak.When the empire fell to pieces,the home country found itself faced with flood and starvation.

树对人类有三个重要方面：提供木材和其他产品,供人们乘凉,他们帮助阻止干旱和洪水（旱灾）.
遗憾的是,在世界许多地方,人还没有意识到这第三这些严重的事实是最重要的.他急于从树上赚钱,他大量砍伐.此外,他通常是太粗心和照顾植物幼树.所以森林慢慢消失.
这不仅意味着将会有更少的树.更为严重的后果是,有树的地方,树根松土让雨水渗进并绑定（固定）土壤,因此就不会轻易被冲走；但是没有树木的地方,雨水落在坚硬的地面流动距离,造成洪水和带走的肥沃的土壤.当所有的表土消失了,但仍然没有无用的沙漠.
二千年前,一个富有和强大的国家把树木砍下来造战船,而争取自己的帝国.建立帝国,但没有树,其土壤,成了贫穷和它变得很虚弱.当这个帝国瓦解的时候,他们的国家发现自己面临着洪水和饥饿.