a greenhorn at sth
at 后接具体工作或活动，表示在该方面缺乏经验。
As a greenhorn at sales, he had a lot to learn.
作为销售方面的新手，他有很多东西要学。
新手；生手；菜鸟
笨拙且缺乏经验的年轻人；无经验的人；不懂世故的人
a person who is awkward and inexperienced; a novice
笨拙且缺乏经验的年轻人
an awkward and inexperienced youth
When I started my first job, I was a real greenhorn and made many mistakes.
刚开始第一份工作时，我是个十足的新手，犯了很多错误。
用法提示：greenhorn 在本句中作名词，指“新手、缺乏经验的人”，作主语补足语。
The old sailors laughed at the greenhorn who could not tie a knot.
老水手们嘲笑那个连绳结都不会打的生手。
用法提示：greenhorn 在本句中作名词，指“生手、笨拙的新人”，作动词短语 laughed at 的宾语。
Don't be too hard on the greenhorns; everyone was a beginner once.
别对新手们太苛刻；每个人都曾当过初学者。
用法提示：greenhorns 是 greenhorn 的复数形式，作名词，指“新手们”，作介词 on 的宾语。
at 后接具体工作或活动，表示在该方面缺乏经验。
As a greenhorn at sales, he had a lot to learn.
作为销售方面的新手，他有很多东西要学。
in 后接行业、领域或组织，强调刚进入其中。
She was a greenhorn in the industry and asked plenty of questions.
她在这个行业里是个新手，问了很多问题。
用于口语，强调在某话题或活动上毫无经验。
I'm a greenhorn when it comes to fixing cars.
说到修车，我完全是个新手。
grammar · medium
易错句子He is greenhorn.
正确表达He is a greenhorn.
greenhorn 是可数名词，单数形式前必须有冠词（a/an/the）或其他限定词；汉语没有冠词，容易漏掉，因此要用 a greenhorn。
grammar · medium
易错句子She is very greenhorn.
正确表达She is very much a greenhorn.
greenhorn 是名词，不能像形容词那样直接用 very 修饰；要表示“非常新手”，须用 very much a greenhorn 或 a complete/total greenhorn 这样的名词结构。
grammar · medium
易错句子We hired two greenhorn last month.
正确表达We hired two greenhorns last month.
greenhorn 是可数名词，前面有 two 这类复数限定词时，名词必须用复数形式 greenhorns；汉语名词不标复数，容易漏加 -s。
novice 较正式、中性，强调处于学习某项技能或领域的初期；greenhorn 更口语化，且带“笨拙、天真、容易受骗”的旧式色彩，常指初入社会或行业的年轻人。
rookie 多指新加入某一职业团队或运动队的人（如新警察、新球员），偏美式口语；greenhorn 更泛化地指缺乏经验且显得笨拙的年轻人，带轻蔑或调侃意味。
amateur 强调“非职业、无报酬”，与是否缺乏经验没有必然关系；greenhorn 的核心是缺乏经验且显得笨拙，不能把业余身份直接等同于生手。
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