求翻译：土壤中不同浓度易解析态和难解析态的芘均表现出先升后降的规律，不同浓度结合态残留芘的变化无一定的规律。芘浓度无规律的变化与HPCD的空腔结构有关。是什么意思？

Different concentrations in the soil easy to resolve state and difficult to resolve the state of pyrene show the law first and then decreased, different concentrations combined with changes in state residual pyrene certain rules. Pyrene concentration of irregular changes with hpcd cavity structure.

Soils in different concentrations to resolve state and difficult to parse the first spots are shown in the following pattern, combined with different concentrations of sulfur trapped mentality changes a degree of regularity. sulfur concentrations with no change in the cavity HPCD structure.

The rule in which after the soil the different density easy to analyze condition and difficult to analyze condition pi displays first rises to fall, the different density union condition remains pi change not certain rule.pi the density disorder change and the HPCD cavity structure concerns.

Easy to parse State in different concentrations in the soil and difficult to resolve the State's laws of pyrene are showing increased firstly and then decreased and pyrene binding residues in different concentration changes without a certain degree of regulation. Pyrene concentrations no HPCD cavity

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