lower scgment

• 下段

lower scgment的用法和样例：

例句

1. Chest CT and fiberoptic bronchoscopy revealed multiple tumors in the lower trachea.
   胸部计算机断层扫描及软式支气管镜检发现在气管下段有多姿性肿瘤。
2. Tan-yellow plaques are seen in the lower esophagus, along with mucosal hyperemia.
   食管下段可见黄褐色的斑块，同时黏膜充血。