请使用英文状态下的标点符号

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HINTS：Users of so-called “dumb” terminals (i.e. those without processing capability)

          PC

          key-board

Online services are managed by a host system that maintains a base of information available to satellite users. Users of so-called "dumb" terminals, that is those without processing capability, simply access the information base via programs stored on the system. Personal computer users typically access the host through a modem. A PC software program serves as an interface between the server and a PC, allowing the user to operate through the online system and select different databases using a key-board or a mouse.
在线服务在一个主系统管理之下，使保持现有卫星用户基础信息管理成为可能。所谓的“傻瓜”终端用户（即没有处理能力的）通过隐藏着系统背后的程序，就可以轻松地访问信息库了。个人计算机用户通常通过调制解调器访问主机。一个PC软件程序就可以作为一个接口，连接用户和PC机，这样用户通过键盘或者鼠标，就可以通过在线系统操作和选择不同的数据库了。 ——译文来自: 帅菲儿