让更多的成员可以在同一时刻发言，并将所有发言者的信息传达给所有参与会议的成员，即所谓的混音。
More members are able to speak in the same time, and deliver one's information to all members, this is audio mixing.
对于发言者和所有技能水平的作家，英语语法傻瓜，第二版提供易于遵循提高你的英语语法命令，实用的信息。
For speakers and writers of all skill levels, English grammar for Dummies, 2nd Edition provides easy-to-follow, practical information for improving your command of English grammar.
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