It means that 1,4-benzoquinone did damnify the ct-DNA,as is one of the ways by which benzene causes cancer,for the reason that benzoquinone is the ultimate metabolic product of benzene.

• 由于苯醌是苯在体内的代谢终产物,因此认为苯醌对DNA的损伤是苯致癌的途径之一。