包络线被用来预测市场价格在平均价格上下波动的范围中轴为一条移动均线将当前均线值加上或减去一个固定的百分比数额则可得到包络线的上下轨
误差模型包络线是GIS位置不确定性研究的重要内容，是GIS可视化研究的关键指标。
How to ascertain boundary envelop of error model is not only of the importance for GIS uncertainty theory, but also the critical index for GIS uncertainty visualization research.
布林线技术指标和移动平均包络线相同，但是不同是外部布林线是怎样创建的。
A Bollinger band technical indicator looks similar to the moving average envelope, but differs in how the outer bands are created.
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