Pericardium fibrosum

例句：

1. 1. The pericardium fibrosum is a thin layer of tissue that covers the heart and helps it move.
   心包纤维层是一层覆盖心脏并帮助其移动的薄组织。
2. 2. During surgery, the surgeon carefully removes the pericardium fibrosum to prevent damage to the heart.
   在手术中，外科医生小心地移除心包纤维层以防止对心脏的伤害。
3. 3. The patient's condition worsened after the surgery, and the pericardium fibrosum had to be resected.
   手术后，患者的病情恶化了，需要切除心包纤维层。