If the trend is up, mark all downside penetrations during the look-back period, add their depths, and divide the sum by the number of penetrations.
如果趋势上涨，记下那些下跌时穿过均线的，加上深度，然后再除以穿过的天数。
If the trend is up, mark all downside penetrations during the look-back period, add their depths, and divide the sum by the number of penetrations.
如果趋势上涨，记下那些下跌时穿过均线的，加上深度，然后再除以穿过的天数。
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