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谁能帮忙注释下这一段代码

这段代码看不懂,谁能帮忙注释下,自定义变量的含义及每行代码的目的,谢谢! extern bool UseATRMode = TRUE; extern int NonATRStopPips = 40; extern int ATRPeriod = 9; extern double ATRMultiplier = 3.0; extern int ATRSmoothing = 0; extern color UpArrowColor = OrangeRed; extern color DnArrowColor = DodgerBlue; extern int ArrowDistance =