When machines were invented, life in the villages changed again. Factories were built. There were a growing number of people living near factories. Because of the increasing people, more and more buildings were built. And then cities were built.

Now, the degree of urbanization has been deepening and we enjoy the convenience brought by urbanization. How does everybody know how the cities began? Long time ago, the world had only a few thousand people. These people moved from place to place, hunting animals for food. No one knows how or when these people learned about growing food. But when they did, their lives changed greatly. One thing is certain that they gathered in the rich place or near water. In that age, water and climate are the most important to lives. It is the rich water and comfortable climate that gathered people from different places. They began to live near one another, so that the first village grew. Many people came to work in the villages. Then the villages became bigger and bigger.When machines were invented, life in the villages changed again. Factories were built. There were a growing number of people living near factories. Because of the increasing people, more and more buildings were built. And then cities were built.

现在，城市化的程度已经加深，我们享受着城市化带来的方便。每个人是怎么知道城市是怎样开始的呢？很久以前，世界上只有几千人。这些人从一个地方到另一个地方，以狩猎动物为食。没有人知道这些人是怎样以及何时学会种植食物的。但是，当他们真正做到的时候，他们的生活发生了很大的变化。有一件可以确定的事就是他们聚集在肥沃或者近水的地方。在那个时代，水和气候对生命是最重要的。丰富的水和舒适的气候把来自不同地方的人们聚到一起。他们开始彼此住的很近，因而第一个村庄诞生了。很多人来到村庄工作，接着村庄变得越来越大。当发明了机器的时候，村庄的生活再一次发生了变化，建立起了工厂。越来越多的人居住在工厂附近。由于人口增长，越来越多的建筑被建立起来，接着就建立起了城市。