此外，副通道以所需的一定间隔横向或斜向焊封或胶粘而分隔成纵向节段；
Two vertical edges of the utility model are overlapped and welded up or glued to form a main channel and an assistant channel.
此外，副通道以所需的一定间隔横向或斜向焊封或胶粘而分隔成纵向节段；
Two vertical edges of the utility model are overlapped and welded up or glued to form a main channel and an assistant channel.
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