n.

1. 刚长羽毛的小鸟；刚会飞的小鸟
2. 未经世故的（年轻）人；缺乏经验的人
   Don't treat him too hard. He is just a fledgling.

   别对他作太多的要求，他只是个没有经验的人。

a.

1. 刚开始的；无经验的

n.

1. a young bird that has just fledged.
2. [as modifier] denoting an inexperienced person or emergent system:
   fledgling democracies.