求Excel公式讲解?两个if函数连在一起怎么理解?

=ABS(ROUNDUP(IF(D$4<=($F$37-1),IF(SUM(D$16,D$20,-D$5)>0,0,SUM(D$16,D$20,-D$5)),0),-3))

公式为:
=IF(L4=0,IF(M4<=0,0,IF(M4>1010,"超重",8+SUM(TEXT(M4-{0,10,150},"0;!0")*{0,0.4,-0.02}))),IF(L4>20,"超大",LOOKUP(L4-1%%,{0,1,3,10},{80,77,72,65})))
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