1、As the young bird matures, such controlled descent gradually gives way to powered flight.
一旦幼鳥成熟，類似這樣的可控降落就會演變成為動力飛行。

2、young bird esp. of domestic fowl.
年幼的鳥，尤指年幼的家禽。

3、young bird that has just fledged or become capable of flying.
羽毛剛長齊的或剛會飛的幼鳥。

4、The young bird fluttered its wings.
雛鳥拍打著它的翅膀。

5、The young bird on the edge of the nest was trying his wings to fly into the world.
巢邊的那只雛鳥正躍躍欲試地撲打著翅膀，準備飛向廣闊的世界。