There emerge some problems in the course of China's urbanization, such as the problem of poverty, the management of public safety, resource problems and so on.
在中国城市化进程中，出现了一些问题如贫困化问题、公共安全管理问题、资源问题等等。
In current E-mail system, there are some problem which must be solved, such as the safety of E-mail, junk E-mail, classification of E-mail, name resource and so on.
该文对现有电子邮件系统中存在的安全性、垃圾邮件、邮件分类、信箱命名资源等问题进行了分析。
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