这句话前半句怎么解释?The first exhibitors conference of China Shanghai World Expo 2010 opened here on Wednesday with organizers saying they would provide developed nations and international organizations with more than 500 patches,each with

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这句话前半句怎么解释?
The first exhibitors conference of China Shanghai World Expo 2010 opened here on Wednesday with organizers saying they would provide developed nations and international organizations with more than 500 patches,each with an area of 500 sq m,to design and build exhibition booths according to their needs
请问,在saying 前面的话怎么能解释的更通顺些,

The first exhibitors conference of China Shanghai World Expo 2010 opened here on Wednesday with organizers saying
中国2010年上海世博会第一次参展方会议周三时候举行,展会的承办者表示

上海2010世博会首展人员会议星期三在这儿开放,组织者说

注意独立主格结构 organizers saying ...
主干 The exhibitors conference opened here on Wednesday .