"a fledgling enterprise" "a fledgling skier" "an unfledged lawyer"
The callow Down began to cloath my Chin.
The first callow flights in authorship.
The callow young world of my acquaintance.
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)