By default, channels constructed with the open methods belong to a global channel group that can be configured using the following system variables.
默认情况下，具有open方法的通道属于一个全局通道组，可利用如下系统变量对其进行配置。
Several attributes of product variables influence the channel structure.
产品变量中的多个属性都影响渠道结构。
In the channel structure model, the market variables play the leading role and the product variables play the supportive role.
在渠道结构模型中，其中市场变量起引导性作用，产品变量起支撑性作用。
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