molting

例句：

1. 1. The baby bird is molting its feathers as it grows up.
   随着成长，这只小鸟儿正在脱换羽毛。
2. 2.The lion is molting its thick fur for the winter.
   狮子正在脱去厚厚的皮毛过冬。
3. 3. The snake is molting its skin to shed its old skin and grow a new one.
   蛇正在脱去旧的皮肤以长出新的皮肤。