名詞 rookie:

1. an awkward and inexperienced youth
   同義詞：cub, greenhorn

rook.ie

n.（名詞）
Slang
【俚語】
An untrained or inexperienced recruit, as in the army or police.
新兵：軍隊(duì)或警界中未受過訓(xùn)練或沒有經(jīng)驗(yàn)的新兵
An inexperienced person; a novice.
新生，生于：無經(jīng)驗(yàn)的人；初學(xué)者
Sports A first-year player, especially in a professional sport.
【體育運(yùn)動(dòng)】 新隊(duì)員：尤指第一年參加聯(lián)賽的職業(yè)球隊(duì)的新隊(duì)員

來源：
Perhaps alteration of recruit
可能為 recruit的變化