求翻译：研究表明(Conell and Markwell, 1990）越易溶解土壤空隙水中或与土壤颗粒表面结合得越弱的多环芳烃就越易被蚯蚓表皮通过被动扩散吸收，土壤组分与蚯蚓组织之间的多环芳烃浓度梯度是被动扩散作用的驱动力，但由于多环芳烃在土壤不同组分之间仍存在相互作用，限制了多环芳烃在蚯蚓体内通过扩散作用而进行生物富集的潜力，所以蚯蚓表皮多环芳烃的浓度较低。是什么意思？

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Studies have shown that (Conell Markwell, 1990) and the more soluble in water or soil voids and surface soil particles with the weaker of the polycyclic aromatic hydrocarbons on the more vulnerable the earthworm skin absorption by passive diffusion, and soil and earthworms per group between PAHs The

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Research indicates that (Conell and Markwell, 1990) more easy dissolved soil gap water in the or and soil particles surface combination was more weak of more ring aromatic on more easy is earthworm epidermal by passive diffusion absorption, soil components and earthworm organization Zhijian of more

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