Each message, or frame, starts with a command and ends with the ASCII sign for a null character.

每个消息(即帧)以一个命令开头，以一个表示null字符的ASCII符号结束。

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Secondly, we introduce a prepositional class-selection semantics, give the frame conditions of the character axioms of the systems.

其次，我们建立命题型的择类语义，给出描述上述系统的特征公理的框架条件。

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Secondly, we introduce the relation semantics, give the frame conditions of the character axioms of KA, prove the frame soundness of KA with respect to the frame conditions.

其次，我们引入关系语义，给出描述KA的特征公理的框架条件，证明KA相对这个框架条件是框架可靠的。

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