求翻译：提高煤层瓦斯抽放的效果，特别是低通气性煤层，一直是瓦斯抽放工作中的难题。特别是随着煤层开采深度的增加, 煤层透气性随之减小，从而严重影响了煤层瓦斯的抽采率和瓦斯抽采效果。然而我国煤矿绝大部分煤层属于低透气性煤层，因此分析低透气性煤层瓦斯抽采的各种技术原理及应用，对提高低透气性煤层瓦斯抽采效果具有重要的意义。是什么意思？

To improve the effect of seam gas drainage, especially with the the hypopnea seam, has been a problem in the gas drainage work. With the increase in coal seam depth, seam permeability decreases, and thus affect the extraction of coal seam gas rate and gas extraction results. However, China's coal mi

Improve the suction of the coalbed gas effect, in particular the low-ventilation, coal gas, has been drawn in the work place. In particular, with coal mining, coal increased depth of ventilation, and thus reduce the severe impact of the coal seam gas and the gas from extraction rates from extraction

Enhances effect which the coal bed gas pulls out puts, specially the low pass disposition coal bed, always is the gas pulls out finishes work makes the difficult problem.Specially along with the coal bed mining depth increase, the

Improving coal seam gas drainage effect, especially in coal seam with low ventilation, gas drainage work has been in the challenge. Especially with the mining depth increases, the coal seam permeability with reduced, thus seriously affecting the rate of coal seam gas drainage and gas drainage effect