以下为句子列表：
英文: This is normal lung microscopically. The alveolar walls are thin and delicate. The alveoli are well-aerated and contain only an occasional pulmonary macrophage (type II pneumonocyte).
中文: 正常肺显微镜显示肺泡壁比较薄弱。肺泡内充满空气，有肺巨噬细胞（II型上皮细胞）。
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英文: Yet another subset of macrophages in lung lavage appear smaller than the normal pulmonary macrophage and may be immature, perhaps due to the premature release of monocyte precursors from the bone marrow and homing to the lungs in response to cigarette smo
中文: 当然在肺部灌洗液中也有其他亚型的巨噬细胞体积较正常肺巨噬细胞的小，而且还可能处于幼稚阶段，可能与骨髓单核细胞前体物质过早释放并对吸烟产生反应而游走至肺部有关。
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