Flying - which represents the product groups trusses and trussing, Pipe battens, Air frames, Lighting Bridges.

吊挂-代表了桁架及桁架系统，灯杆，悬挂框架，灯桥。

The fourth part Study two kinds of new-type channel mode structure, namely the mode of monopolized shop and trussing up the mode of selling, analyse the structure characteristic of the channel.

第四部分研究了两种新型渠道模式结构，即专卖店模式和捆绑销售模式，分析渠道的结构特征。