pericardial branch of thoracic aorta

例句：

1. 1. The pericardium is the sac that surrounds the heart.
   心包是包围心脏的囊状结构。
2. 2.He had to operate on his pericardium.
   他不得不对他心包进行手术。
3. 3. The patient's condition worsened after the surgery.
   手术后，患者的病情恶化了。