Figure 8. Case 5. Three-vessel-trachea view showing a supernumerary vascular structure (purple) on the left of the pulmonary artery (blue), which represents a persistent left superior vena cava.是什么意思_Figure 8. Case 5. Three-vessel-trachea view showing a supernumerary vascular structure (purple) on the left of the pulmonary artery (blue), which represents a persistent left superior vena cava.在线翻译_英语_读音_用法_例句