1
the complainant in + [case/proceedings]
in 后接案件、审理等，用来说明原告参与的具体法律程序。
The complainant in the case gave evidence yesterday.
该案的原告昨天作了证。
原告；告诉人；控诉人
先理解核心含义，再看它在真实句子里的用法。
原告；告诉人；控诉人
a person who brings a case in a court of law
The complainant in the case gave evidence yesterday.
该案的原告昨天作了证。
投诉人；抱怨者。
One who makes complaint, one who complains.
在法庭上提起诉讼的人
a person who brings an action in a court of law
提起民事诉讼的一方；原告。
The party that brings a civil lawsuit against another; the plaintiff.
刑事调查或审判中的据称受害人。
An alleged victim in a criminal investigation or trial.
The complainant presented evidence to support her claim.
原告出示证据以支持她的索赔。
The judge asked the complainant to describe what happened.
法官要求原告描述所发生的事情。
The court ruled in favor of the complainant after the trial.
法院在审判后作出了有利于原告的裁决。
in 后接案件、审理等，用来说明原告参与的具体法律程序。
The complainant in the case gave evidence yesterday.
该案的原告昨天作了证。
complainant 作主语时，常接 allege、claim 等法律动词，再用 that 从句陈述指控内容。
The complainant claimed that the defendant had broken the agreement.
原告声称被告违反了协议。
as the complainant 表示以原告的身份或资格；在正式法律文体中有时省去 the。
She appeared as the complainant in the arbitration hearing.
她在仲裁听证会上以原告身份出庭。
Not this
He complainant to the police about the theft.
Use this
He complained to the police about the theft.
complainant 是名词，表示“原告/投诉人”，不能当动词用；表示“向……投诉”应用动词 complain 的过去式 complained。
Not this
The complainant was submitted to the court yesterday.
Use this
The complaint was submitted to the court yesterday.
complainant 指人（原告），complaint 指书面投诉或诉状；提交给法院的应是 complaint，而不是 complainant。
Not this
She is the complainant of this lawsuit.
Use this
She is the complainant in this lawsuit.
表示“某案件中的原告”时，complainant 后接介词 in，不用 of；in 强调她在此法律程序中的身份。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
原告声称
The complainant alleges that the defendant breached the contract.
原告声称被告违反了合同。
原告的证词
The court gave considerable weight to the complainant's testimony.
法庭十分重视原告的证词。
原告与被告
The judge asked both the complainant and the defendant to remain seated.
法官要求原告和被告都留在座位上。
案件中的原告
She was the complainant in a defamation case.
她是一起诽谤案中的原告。
原告的诉求
The complainant's claim was dismissed for lack of evidence.
原告的诉求因证据不足被驳回。
原告出庭
The complainant appeared before the court to give evidence.
原告出庭作证。
发长 /eɪ/ 音 (如 rain, wait)
Use complainant naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记法：complain（抱怨）+ -ant（人）→ 在法庭上抱怨（起诉）的人，即原告。
语域：formal 常见场景：court、legal documents、legal proceedings 在法律语境中，complainant 通常指提起诉讼的原告，多用于法庭或法律文书等正式场合。
没有常用词与 complainant /kəmˈpleɪnənt/ 完全押韵。complain /kəmˈpleɪn/ 和 complaint /kəmˈpleɪnt/ 有相同的重读元音 /eɪn/，但不带最后的 /ənt/，只是相近音；claimant、defendant、applicant、informant 都以 -ant 结尾，但重读元音或后面的辅音不同，均不押韵。
Dictionary facts from ECDICT, WIKTIONARY.