求翻译：Indeed, cilomilast was the most potent at early stage (days 4 and 7) of bleomycin-induced PF, when inflammation is the major characteristic of the pathological process [5]. Total number of alveolar inflammatory cells in BALF of treated mice was significantly reduced, as well as number of macrophages and lymphocytes. These results are consistent with the fact that PDE4 expression is induced by inflammatory stimulus and that it mediates activation and proliferation of T-cells and function of macrophages [25-28]. In turn, macrophages represent the major inflammatory cell type in alveolus, thereby strongly influencing total cell count values [29,30].是什么意思？

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