公共对象层管理网络服务对象，访问现场总线设备，元件层实现不同现场设备间的互操作。
Networks service object was managed, and the field bus equipments were visited with public target layer. The inter-operation among different equipments was realized with component layer.
网络空间同现实社会一样，既要提倡自由，也要保持秩序。
网络文化是网络技术同现实文化相结合的产物，最终它也不可能脱离现实的存在，它的形成对传统文化的挑战是一种必然。
Net culture is also the production, which is bonded from net technology and culture in reality, and it, not deviating from the reality, will challenge traditional culture at last.
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