plume attenuation

例句：

1. 1. The bird's plumage was noticeably different from its parents.
   这只鸟的羽毛与它的父母明显不同。
2. 2.The research focused on the plumage attenuation of birds during migration.
   研究关注了鸟类迁徙期间羽毛衰减的现象。
3. 3.The plumage attenuation is a natural process that occurs in many species.
   羽毛衰减是一个自然过程，许多物种都会经历这个过程。