To shed periodically part or all of a coat or an outer covering,such as feathers,cuticle,or skin,which is then replaced by a new growth.

• 蜕皮，换毛分阶段地脱掉部分或全身的皮毛或表面覆盖物，如羽毛、表皮或外皮，随后便为新长出的代替。