求翻译：三 许多文献研究表明HPCD萃取能很好的预测多环芳烃对微生物的生物有效性，包括三环和四环，然而我的结果表明对三环的菲，能很好的预测，对四环的芘，有一定的局限性。可能多环芳烃作为底物被微生物代谢和降解，是什么意思？

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Three studies have shown that many documents HPCD extraction well predict the bioavailability of polycyclic aromatic hydrocarbons on microorganisms, including three and four ring, yet my results showed Philip on the third ring, well forecast, pyrene to tetracycline, has certain limitations. Polycycl