我是新手，第一个EA就翻了五倍.... 中彩了！请高手解答！

其实就是MT4自带的MA系统，修改了下参数....测试结果翻了五倍，虽然仍会爆仓，不过志在学习了！现有几个问题：
  1，这个系统的资金管理是什么原理？为什么我设仓位是一手，会出现2.2手斟至14.9手.............
  2，我测试的时间是90至今，却只成交了四单.........
  3，如果有达人把系统的英文提示翻译或解说一下就万分感谢了，好多地方我都不明白，只是依胡画瓜，但是我想从零开始认真学习! 侠版的教学不错，但是偶没有分.........5555555555555~
  
  //+------------------------------------------------------------------+
  //| Moving Average.mq4 |
  //| Copyright ?2005, MetaQuotes Software Corp. |
  //| http://www.metaquotes.net/ |
  //+------------------------------------------------------------------+
  #define MAGICMA 20050610
  
  extern double Lots = 1;
  extern double MaximumRisk = 0.2;
  extern double DecreaseFactor = 1;
  extern double MovingPeriod = 200;
  extern double MovingShift = 10;
  //+------------------------------------------------------------------+
  //| Calculate open positions |
  //+------------------------------------------------------------------+
  int CalculateCurrentOrders(string symbol)
  {
  int buys=0,sells=0;
  //----
  for(int i=0;i0) return(buys);
  else return(-sells);
  }
  //+------------------------------------------------------------------+
  //| Calculate optimal lot size |
  //+------------------------------------------------------------------+
  double LotsOptimized()
  {
  double lot=Lots;
  int orders=HistoryTotal(); // history orders total
  int losses=0; // number of losses orders without a break
  //---- select lot size
  lot=NormalizeDouble(AccountFreeMargin()*MaximumRisk/1000.0,1);
  //---- calcuulate number of losses orders without a break
  if(DecreaseFactor>0)
  {
  for(int i=orders-1;i>=0;i--)
  {
  if(OrderSelect(i,SELECT_BY_POS,MODE_HISTORY)==false) { Print(\"Error in history!\"); break; }
  if(OrderSymbol()!=Symbol() || OrderType()>OP_SELL) continue;
  //----
  if(OrderProfit()>0) break;
  if(OrderProfit()1) lot=NormalizeDouble(lot-lot*losses/DecreaseFactor,1);
  }
  //---- return lot size
  if(lot1) return;
  //---- get Moving Average
  ma=iMA(NULL,0,MovingPeriod,MovingShift,MODE_SMA,PRICE_CLOSE,0);
  //---- sell conditions
  if(Open[1]>ma && Close[1]1) return;
  //---- get Moving Average
  ma=iMA(NULL,0,MovingPeriod,MovingShift,MODE_SMA,PRICE_CLOSE,0);
  //----
  for(int i=0;ima && Close[1]

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