ex·fo·li·a·tion /(ˌ)ɛksˌfolɪˈeʃən/ 名詞
  脫落,剝落
  Ex·fo·li·a·tion n.  The scaling off of a bone, a rock, or a mineral, etc.; the state of being exfoliated.
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  exfoliation
       n 1: the peeling off in flakes or scales of bark or dead skin;
            "exfoliation is increased by sunburn"
       2: a thin flake of dead epidermis shed from the surface of the
          skin [syn: scale, scurf]