求翻译：渗透率是影响煤层气勘探选区的重要参数，但关于渗透率演化机理的认识不清楚，尚未形成科学、系统的煤储层渗透率评价方法。是什么意思？

Permeability is an important parameter of the impact coalbed methane exploration constituency, but clear understanding on the evolution mechanism of the penetration rate has not yet formed a scientific and systematic evaluation method of the coal reservoir permeability.

Penetration is affected constituencies of the coal bed gas exploration for important parameters on penetration rate, but the evolution of knowledge management is not clear, not a scientific system of coal, reservoir permeability assessment methods.

The penetration coefficient is affects the coal bed gas to explore the electoral district the important parameter, but evolves the mechanism about the penetration coefficient the understanding not to be clear, not yet forms the science, the system coal reservoir penetration coefficient assessment me

Permeability is important parameter affecting coal-bed gas exploration constituency, but on permeability evolution mechanism is not clear, not yet scientific, systematic evaluation method of coal reservoir permeability.

penetration is affected constituencies coal bed gas exploration for the critical parameters on penetration rate, but the evolution of the lack of clear understanding has not yet been formed, science, system of coal reservoir permeability evaluation methodologies. ;