Each dialog state has one of more grammars associated with it, that are used to describe the expected user input, either spoken input or touch-tone (DTMF) key presses.

• 每个会话组都有一套适合他的语法规范，这些语法规范描述了预期的用户输入，可能是语音输入或者基于按键声音(DTMF)的键盘输入。