callus wood

例句：

1. 1. The wound had healed into a callus.
   伤口愈合成了硬皮。
2. 2. The scar on his face isa reminder of his past battles.
   他脸上的疤痕是过去战斗的提醒。
3. 3. Thecallus was removed by the doctor toreveal the underlying bone.
   医生将硬皮去除以揭示下面的骨头。