论文从安全问题的现状、分类和对策入手，提出VPN技术及用VPN技术实现安全通信。
Beginning with the current situation, classification and countermeasure of the information security, then we bring forward the VPN technology.
目前畜产品的质量安全问题突出，主要介绍了畜产品质量安全存在的问题、原因及对策。
The problem about the quality and safety of animal products is very serious, this article introduces its reason and strategy about the quality and safety of animal products.
目前畜产品的质量安全问题突出，主要介绍了畜产品质量安全存在的问题、原因及对策。
The problem about the quality and safety of animal products is very serious, this article introduces its reason and strategy about the quality and safety of animal products.
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