1. 新手;菜鳥(niǎo);(尤指)新兵,新警員 A rookie is someone who has just started doing a job and does not have much experience, especially someone who has just joined the army or police force.
e.g. I don't want to have another rookie to train. 我不想再訓練新兵了。 e.g. ...a rookie police officer. 新上任的警官
2. (第一年參加體育比賽的)新隊員 A rookie is a person who has been competing in a professional sport for less than a year.