报文交换（Message Exchanging） 数据链路层（Data Link）：传输的数据以帧为单位，具有差错控制能力 逻辑链路控制子层(LLC) 介质访问控制子层(MAC) .
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The platform also provides the functions of the common network service such as on-line message exchanging.
该平台还具备一般网络服务如在线交流等功能。
Interactive controlling is the most important function of the computer as well as the basic ways of the message exchanging between the computer and the operator.
交互控制是计算机程序的重要功能，也是实现人—机对话的基本途径。
The canonical message model represents the standardized format used for exchanging business information on a service bus.
规范化消息模型表示用于在服务总线上交换业务信息的标准化格式。
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