Shirabe
要因
Common Noun Noun
Español jmdict
1
noun (common) (futsuumeishi)nouns which may take the genitive case particle 'no' causa principal;factor primordial
English jmdict
1
noun (common) (futsuumeishi)nouns which may take the genitive case particle 'no' main cause;primary factor
There seems to be a slight difference on the treatment of the B factor between their approaches.