如果醉了，就挥洒记忆，
随着人口的增长，人类活动的影响已经越来越明显。火烧迹地变成了道路，分散的农场已连成一片，沼泽地和林地面积减小，甚至消失。早期建在河流堤岸上的村庄大面积向外扩展，并通过增加道路、铁路以及运河连接起来。在那些土地利用与其场地环境非常相适应的地方，农场、道路、社区处处显得协调。
Li Yan, an engineer, was born on February 9, 1965 in Beijing, China. After he graduated from Qinghua University in 1987, he made an important decision in his life. He decided to go to the United States for his further study. After four years hard work, he mastered new management ideas an advanced technologies in computer field. In 1992, he got his doctors degree. In 2008, he made another decision that to return to his motherland and started a company. However, his wife and daughter had got used to the American way of life, so they still stay in the United States. But they still can meet frequently, because of the convenient transportation, and his wife and daughter often visit him in holidays.
