Participants who wish to join a multicast session send a request to join the session to their local MBONE router.
参加者想要加入到多点传送的会话，发送一个请求去加入会话，到他们本地的MBONE路由器。
Participants who wish to join a multicast session send a request to join the session to their local MBONE router.
参加者想要加入到多点传送的会话，发送一个请求去加入会话，到他们本地的MBONE路由器。
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