系统对大家说:guest1进入会议室!(Wed Jul 12 11:31:06 CST 2006)
guest1对大家说:sdfsdlfjlk(Wed Jul 12 11:31:10 CST 2006)
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系统对大家说:guest1退出了会议室！(Wed Jul 12 11:31:21 CST 2006)
