在左肺下叶支气管层面上，上段支气管发出。
On the section through left inferior lobar bronchus, superior segmenta1 bronchus appeared.
脊柱层面，两肺下叶主要表现为上段、外侧底段和后底段的支气管和血管。
On the section through spinal column, the inferior lobes of bilateral lungs shows the bronchi, arteries, and veins of superior, lateral basal, and posterior basal segments mainly.
脊柱层面，两肺下叶主要表现为上段、外侧底段和后底段的支气管和血管。
On the section through spinal column, the inferior lobes of bilateral lungs mainly showed the bronchi, arteries and veins of superior, lateral basai and posterior basai segments.
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