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a criminologist
criminologist 是可数名词，指犯罪学学者；用 a/an 表示一位。
She is now a criminologist.
她现在是犯罪学家。
犯罪学家；犯罪学学者
criminologists — plural of criminologist
先理解核心含义，再看它在真实句子里的用法。
犯罪学家；犯罪学学者
a specialist in criminology
She is now a criminologist.
她现在是犯罪学家。
从事犯罪学研究的人
One who practices criminology.
The criminologist spent years studying patterns of urban crime.
这位犯罪学家花了多年时间研究城市犯罪模式。
A criminologist explained how social factors influence crime rates.
一位犯罪学家解释了社会因素如何影响犯罪率。
Many criminologists work closely with police departments to improve public safety.
许多犯罪学家与警察部门密切合作，以改善公共安全。
criminologist 是可数名词，指犯罪学学者；用 a/an 表示一位。
She is now a criminologist.
她现在是犯罪学家。
as a criminologist 是介词短语，作状语，表示“以犯罪学家的身份”。
He worked as a criminologist for the government.
他曾以犯罪学家的身份在政府工作。
定冠词 the 表示特指，who/that 从句说明是哪一位犯罪学家。
The criminologist who wrote this book is famous.
写这本书的犯罪学家很有名。
Not this
He is criminologist.
Use this
He is a criminologist.
criminologist 是可数名词，表示职业身份时前面需要不定冠词 a/an；汉语“他是犯罪学家”没有冠词，所以容易漏掉 a。加上 a 才能构成“一位犯罪学家”这个单数可数名词短语。
Not this
A criminologist is someone who commits crimes.
Use this
A criminal is someone who commits crimes.
criminologist 指研究犯罪学的学者，criminal 才指实施犯罪行为的人；两者在汉语中都与“犯罪”有关，但不能互换。这里要表达“罪犯”应该用 criminal。
Not this
She wants to be a criminology.
Use this
She wants to be a criminologist.
criminology 是学科名“犯罪学”，不能指人；表示“犯罪学家”要用派生名词 criminologist。汉语中“犯罪学家”和“犯罪学”词形相近，但英语需要用 -ist 后缀构成指人的名词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
杰出的犯罪学家
A prominent criminologist spoke about the rise in juvenile crime.
一位杰出的犯罪学家谈到了青少年犯罪率上升的问题。
法医犯罪学家
The forensic criminologist helped analyze the crime scene data.
法医犯罪学家协助分析了犯罪现场的数据。
犯罪学家研究
Criminologists study the social causes of criminal behavior.
犯罪学家研究犯罪行为的社会成因。
犯罪学家认为
Many criminologists argue that prevention is better than punishment.
许多犯罪学家认为预防比惩罚更好。
批判犯罪学家
As a critical criminologist, she challenges traditional views on punishment.
作为一名批判犯罪学家，她对传统的刑罚观念提出质疑。
Use criminologists naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：criminologist 里藏着 criminal（犯罪），-ologist 是‘学家’；想象犯罪学家在勘查罪案现场。
语域：neutral 常见场景：学术研究、新闻报道 通常用于学术、法律或新闻报道等专业场合，日常口语中较少见。
The -ologist words (biologist, psychologist, anthropologist, pathologist) rhyme with criminologist: the stressed vowel is /ɒ/ in each and the following /lədʒɪst/ matches. Criminology shares the same root and stress but ends in /i/, so it does not rhyme. Criminal begins with the same letters 'crimin' but has different stress and vowels, so it is a useful lookalike, not a rhyme.
Dictionary facts from ECDICT, WIKTIONARY.