With the world's population estimated to grow from six to nine billion lay 2050, researchers, businesses and governments are already dealing with the impact this increase will have on everything from food and water to infrastructure and jobs.

　　英语四级译文:

　　到2050年预计世界人口将从6亿增长到9亿，研究人员、企业和政府已经开始着手应对人口增长所带来的从食物、水资源到基础设施及就业等各方面的影响。

　　四级词汇讲解:

　　本句的主干是researchers, businesses and governments are already dealing with the impact。句首是with结构作状语，impact后面的this increase will have是定语从句，对其进行修饰，注意此处省略了关系代词that。

　　have an impact on意为“对……有影响”。如:

　　These are major policy decisions and they have solved many important problems; they are bound to shake things up and have an impact on education, industry and other spheres.这都是些很重大的决策，解决了很多重要的问题，一定会引起强烈反响，会影响到教育、工业等各个领域。

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