编写条件：
一颗阳线后连续3天阴线，阳线实体无限制，并且，阴线量能递减，第三日收盘在21天线上。编写方法：
ma21:=MA(CLOSE,21);
REF(C,3)>REF(O,3) AND REF(C,2)<REF(O,2) AND REF(C,1)<REF(O,1) AND C<O AND V<REF(V,1) AND REF(V,1)<REF(V,2) AND REF(V,2)<REF(V,3) AND C>MA21;
编写条件：
一颗阳线后连续3天阴线，阳线实体无限制，并且，阴线量能递减，第三日收盘在21天线上。编写方法：
ma21:=MA(CLOSE,21);
REF(C,3)>REF(O,3) AND REF(C,2)<REF(O,2) AND REF(C,1)<REF(O,1) AND C<O AND V<REF(V,1) AND REF(V,1)<REF(V,2) AND REF(V,2)<REF(V,3) AND C>MA21;
