It is because of the proximity of the pleurae to the lung that many people mistakenly think of pleural mesothelioma as a form of lung cancer.
因为胸膜接近于肺，大多数人误认为胸膜间皮瘤是肺癌的一种形式。
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There are two pleurae in the chest cavity and their job is to protect and cushion the lung by secreting fluid that allows the lung to move smoothly within the chest cavity when breathing.