intestinal surface

例句：

1. 1. The intestinal surface is covered in a thin layer of mucus.
   肠道表面覆盖着一层薄的黏液。
2. 2. The doctor examined the patient's intestinal surface for any signs of infection.
   医生检查了患者的肠道表面，寻找任何感染的迹象。
3. 3. The intestinal surface plays a crucial role in digestion and absorption.
   肠道表面在消化和吸收过程中起着至关重要的作用。