趋势交易：金叉买入，白线减仓，死叉卖出，把握大趋势。
{轨道趋势主图指标}
UPPER:MA(CLOSE,20)+2*STD(CLOSE,20);
LOWER:MA(CLOSE,20)-2*STD(CLOSE,20);
MID:MA(CLOSE,20);
STICKLINE(C>=O,C,O,3,0),COLORRED;
STICKLINE(C>=O,H,L,0,0),COLORRED;
STICKLINE(C<O,C,O,3,0),COLORGREEN;
STICKLINE(C<O,H,L,0,0),COLORGREEN;
DRAWKLINE(HIGH,OPEN,LOW,CLOSE);
