结果：1．7天和14天高氧组肺组织出现肺泡结构破坏明显、肺泡大小不等、数目较少、局部肺不张、肺间隔明显增厚；
Destroyed alveolars, decreased number of alveoli, local atelectasis and thickened alveoli septum were observed in the hyperoxic-damaged lungs of the 7th and 14th day.
张双楼煤矿主采煤层为7煤和9煤，两层煤之间赋存唯一一层厚硬岩层，即9煤层的直接顶也是7煤层的直接底。
The hard-and-thick strata ACTS both as the floor of coal seam No. 7 and as the roof of coal seam No. 9 in Zhangshuanglou coal Mine; and coal seam No. 9 is also hard.
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