The feather is not yet fully grown.;still young and immature [inexperienced];unfledged ;
An unfledged or nestling hawk. It is a bird in full feather.
羽毛未丰或未离巢的鹰。它是一只羽毛丰满的鸟。
A small unfledged sparrow on the window sill.
窗台上有一只羽毛未丰的小麻雀.
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