rate of feathering

例句：

1. 1. Thebird's rate of feathering isa key indicator of its health.
   这只鸟的羽毛生长速率是其健康状况的关键指标。
2. 2.The rate of feathering can vary greatlydepending on the species and age of thebird.
   羽毛生长速率可以根据鸟类的种类和年龄有很大的变化。
3. 3. Researchers are studying the rateof feathering in order to better understandthe behavior of birds during migration.
   研究人员正在研究羽毛生长速率，以便更好地理解鸟类在迁徙期间的行为。