penetrating duct sign

• 管穿透征

penetrating duct sign的用法和样例：

例句

1. A tan is created by UV rays penetrating the upper layers of your skin.
   晒黑机能够发射出紫外线，穿透您的上层肌肤。
2. Conclusion Penetrating keratoplasty was an effective treatment for corneal dystrophy.
   结论穿透性角膜移植是治疗角膜营养不良的有效手术方法。