求翻译：Besides inflammation, PF is characterized by tissue remodeling and accumulation of extracellular matrix components. This ultimately results in impairment of gas exchange due to thickened interstitium and in worsening of lung mechanical properties due to increasing stiffness of the tissue [1]. As expected, decreased pulmonary compliance, higher fibrosis degree and higher lung collagen level were observed at days 14 and 24 in mice that received instillation of bleomycin. Progression of fibrosis is illustrated by lower compliance and higher fibrosis score at day 24 compared to day 14. Typical manifestations of bleomycin-induced PF, such as patchy pattern and interstitial inflammation were also observed.是什么意思？

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