请阅读该段落,然后在该段落中找到符合给定定义的术语。 A 75-year-old man was admitted with suspected pneumothorax due to an auto accident. He was hyperventilating and cyanotic. The patient was breathing regularly, he was taken to the ward. While in the hospital, he required a bronchiolar lavage, a bronchoscopy and a biopsy. The pleural fluid showed no cells. He developed pneumonia. Find the word that means: Air in the chest ( ) Opening in the trachea ( ) Infection in the lungs ( )