剑桥词典a thin membrane covering each lung that folds back to make a lining for the chest cavity 胸膜 The pleura protects your lungs and helps them slide back and forth as they expand and contract during breathing . 胸膜保護你的肺，竝讓其可以在呼吸時因膨脹收縮而前後移動。 返回 pleura