以下为句子列表：
英文: Background: The oerall safety of surgical lung biopsy in patients with idiopathic interstitial pneumonia (IIP) remains controersial.
中文: 背景：患特发性间质性肺炎（IIP）的病人行外科肺活检术的总的安全性仍存在争议。
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英文: Transbronchial lung biopsy materials were obtained for light microscopic and electron microscopic examination.
中文: 结果主要的形态学改变是：光镜下为肺泡炎和纤维化。
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