Did you know that using a cell phone could be dangerous to your health? People are worried that using cell phones might cause brain cancer or other health problems.

As a result, companies that make cell phones plan to label cell phone packages with information about the amount of radiation that comes out of each phone.

Two cell phone companies, Nokia and Ericsson, are developing a standard way to measure the radiation.

Although research has not proved any connection between cell phones and health problems, experts believe that more research is necessary.

A neurologist in the United States recently filed a US$800 million lawsuit against a cell phone manufacturer. The lawsuit says that a cell phone caused a brain tumor.

Today more than 500 million people around the world use cell phones. The number of cell phone users is expected to increase to more than 1 billion people in the next five years.

难点词汇：　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　
　　cell phone 手机　 　　　　　　radiation 放射物　　　　　　　　　standard 标准的
　　　expert 专家　　　　　　　　neurologist 神经学者　　　　　　　 tumor 肿瘤