left pulmonary veins

例句：

1. 1.The left pulmonary veins are responsible for carrying oxygenated blood from the heart to the lungs.
   左肺静脉负责将富含氧气的血液从心脏输送到肺部。
2. 2. During surgery, it is important to identify and ligate the left pulmonary veins to prevent bleeding.
   在手术中，识别并结扎左肺静脉以防止出血非常重要。
3. 3. The patient was found with a collapsed left pulmonary vein, indicating severe respiratory distress.
   患者被发现有塌陷的左肺静脉，表明呼吸窘迫严重。