目前有关甲醛和苯联合毒性的研究较少，对遗传毒性的联合效应研究的报道更少。

Now there are few studies on the joint toxicity of formaldehyde and benzene, especially the reports of joint genotoxicity.

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目前对甲醛和苯的单独毒性作用研究较多，但对于二者联合神经毒性的效应和机制研究较少。

Now there are lots of reports about neurotoxic effect induced by formaldehyde or benzene, but few about neurotoxicity of joint exposure to the two substances.

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