1. 刚长羽毛的小鸟;刚学飞的幼鸟
A fledgling is a young bird that has its feathers and is learning to fly.

2. 新手的;(组织或系统)新建的，没有经验的
You use fledgling to describe a person, organization, or system that is new or without experience.

1. young bird that has just fledged or become capable of flying

Synonym: fledgeling

2. any new participant in some activity

Synonym: newcomerfledgelingstarterneophytefreshmannewbieentrant