spalling of rail head

例句：

1. 1. The skin on the apple is beginning to spalling.
   苹果上的皮肤开始脱皮了。
2. 2. The tree's bark was spalling off in large patches.
   树的树皮大片大片地剥落。
3. 3. She noticed that her nails were spalling and itching.
   她注意到她的指甲开始脱皮并痒。