n. 刚会飞的小鸟, 尚缺乏经验者, 初出茅庐的人

a. 初出茅庐的, 尚缺乏经验的

fledgeling \fledgeling\, fledgling \fledgling\n.
a new member of a group.

Syn: newcomer, fledgeling, starter, neophyte, freshman,
entrant.
[WordNet 1.5]

2. A young bird just fledged. [WordNet sense 2]