说明：  ,优化QoS(服务质量) 的业务模型主要有intserv(集成服务) 、diffserv(区分服务) 和MPLS(多协议标签交换)
(, Optimizing the QoS (Quality of Service) business model mainly intserv (integration services), diffserv (Differentiated Services) and MPLS (Multi Protocol Label Switching))