cardiac veins

例句：

1. 1.The cardiac veins are responsible for carrying blood back to the heart.
   心脏静脉负责将血液输送回心脏。
2. 2. Cardiac veins are often used in medical imaging to help diagnose heart conditions.
   心脏静脉常用于医学成像，以帮助诊断心脏病。
3. 3.During exercise, the cardiac veins dilate to increase blood flow to the muscles.
   在运动时，心脏静脉扩张以增加肌肉的血流量。