求翻译：NS2 支持各种常用的业务模型，包括ftp 业务模型、CBR 业务模型、On\Off 业务模型等。同时它还支持TCP 和UDP 两种传输协议以及多种路由协议，包括分级路由协议，包括分级路由、广播路由、多播路由、动态路由等，这极大方便了用户的使用。另外支持通过C++二次开发用户自己需要的协议是什么意思？

ns2 to support a variety of business models, including ftp business model, cbr business model, on \ off business model. It also supports tcp and udp two transport protocols, as well as a variety of routing protocols, including hierarchical routing protocols, including hierarchical routing, broadcast

NS 2 supports a variety of common business models, including FTP CBR business model, business model, On\Off business model, and so on. It also supports UDP TCP and two transport protocols, and many types of routing protocols, including hierarchical routing protocols, including hierarchical routing,

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NS2 support a variety of common business models, including FTP, CBR business model, business model On\Off business model. At the same time it also supports both TCP and UDP transport protocols, as well as a variety of routing protocols, including hierarchical routing protocol, including hierarchical

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