双通道法——预警大行情的高阶工具（1/5） 简介：布林带通道的一种有效用法是通过观察收窄变化来预警下一段趋势行情的发生，但怎样定义什么是“收窄”呢？直观呈现给大家，如何结合特凯纳通道，来确定布林带收窄。
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