1
a juror on a jury
on a jury 是固定搭配，表示“在陪审团中”，比 of a jury 更常用。
She was a juror on a jury that deliberated for two days.
她是一个审议了两天的陪审团中的陪审员。
陪审员
先理解核心含义，再看它在真实句子里的用法。
陪审员
a person who serves on a jury
She was a juror on a jury that deliberated for two days.
她是一个审议了两天的陪审团中的陪审员。
陪审团的一员
A member of a jury.
在陪审团中服务(或等待被召唤服务)的人
someone who serves (or waits to be called to serve) on a jury
The juror listened carefully to all the evidence before the trial continued.
那位陪审员在庭审继续前仔细听取了所有证据。
Each juror must decide the case based only on the facts presented in court.
每位陪审员必须只根据法庭上陈述的事实来裁决案件。
The judge thanked the jurors for their time and patience after the verdict was announced.
宣布裁决后，法官感谢陪审员们付出的时间和耐心。
on a jury 是固定搭配，表示“在陪审团中”，比 of a jury 更常用。
She was a juror on a jury that deliberated for two days.
她是一个审议了两天的陪审团中的陪审员。
serve as a juror 是常见搭配，表示“担任陪审员”；如需说明所审理的案件，后可接 in a case/trial。
He served as a juror in a trial.
他在一场审判中担任陪审员。
这个被动结构表示被法院传召履行陪审义务，日常口语中也常说 do jury duty。
A citizen can be called to serve as a juror at any time.
一位公民随时可能被传唤担任陪审员。
Not this
She was a jury in the trial.
Use this
She was a juror in the trial.
汉语中“陪审员”和“陪审团”是两个概念，英语里jury指整个陪审团，juror才指其中一名成员，不能把jury当作个体来用。
Not this
There are two juror in the courtroom.
Use this
There are two jurors in the courtroom.
juror是可数名词，复数形式为jurors，表示两个或以上个体时须用复数形式。
Not this
He served as juror in the trial.
Use this
He served as a juror in the trial.
juror是可数名词单数，首次提及时需加不定冠词a，表示“一名陪审员”，不可省略。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
担任陪审员
She was called to serve as a juror in a criminal trial.
她被传唤在一起刑事案件中担任陪审员。
备选陪审员；可能被选入陪审团的人
The court asked each prospective juror about their connection to the case.
法庭询问每位备选陪审员与该案的关系。
陪审员遴选
Juror selection can take several days in a high-profile case.
在备受关注的案件中，陪审员遴选可能需要数天时间。
陪审员候选名单；陪审员库
The names are drawn at random from the pool of jurors.
名字是从陪审员候选名单中随机抽取的。
Use juror naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
jury（陪审团）+ or（人），juror 就是陪审团里坐着的那位成员。
语域：neutral 常见场景：courtroom、legal documents 该词多用于法律或正式场合，通常指在法庭上参与陪审的人员；日常口语中较少使用，比较常见于法院审理或司法文书等语境。
The listed words end in -or and in AmE have a final unstressed /ɚ/, matching the final syllable of 'juror' /ˈdʒʊrɚ/. They are not true rhymes with 'juror', because their stressed vowels differ. Beware lookalikes like 'door' (/dɔːr/) and 'for' (/fɔːr/), where -or is pronounced /ɔːr/.
Dictionary facts from ECDICT, WIKTIONARY.