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| 左肺下叶支气管 (左主支气管的延续，分布于左肺下叶。分出上段支气管后，主干称基底干支气管。基底干支气管长约 1.5cm,行向外后下方，分为前内侧底段支气管、外侧底段支气管和后底段支气管) | |||
| 左肺下叶支气管 | |||
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