它是用户的应用程序用来通信的一个会话总线。
It is a session bus that the user's applications will use to communicate.
当前对话的缺省总线称为会话总线，而且这事桌面程序最常用的一个。
The default bus for the current session is called 'the' session bus and is the one that desktop applications will tend to use most often.
还将有很多会话总线(session buses)，这些总线当用户登录后启动，属于那个用户私有。
There will also be many session buses, which are started when a user logs in and are private to that user.
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