这个公式的第一句具体含义

编写要求：

我是菜鸟，搞不懂这一句有什么用以及具体含义，非常感谢。 VAR1:=IF(YEAR>1990 AND YEAR<2003,0,1); VAR2A:=MA(3*SMA((CLOSE-LLV(LOW,27))/(HHV(HIGH,27)-LLV(LOW,27))*100,5,1)-2*SMA(SMA((CLOSE-LLV(LOW,27))/(HHV(HIGH,27)-LLV(LOW,27))*100,5,1),3,1),5)*VAR1; VAR2B:=5; VAR2C:=CROSS(VAR2A,VAR2B); DRAWICON(VAR2C,LOW-LOW*1/100,1);

解答：

?VAR1:=IF(YEAR>1990 AND YEAR<2003,0,1);

VAR2A:=MA(3*SMA((CLOSE-LLV(LOW,27))/(HHV(HIGH,27)-LLV(LOW,27))*100,5,1)-2*SMA(SMA((CLOSE-LLV(LOW,27))/(HHV(HIGH,27)-LLV(LOW,27))*100,5,1),3,1),5)*VAR1;