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a state trooper
在美国，trooper 常特指州警（state trooper）。
A state trooper stopped the car for speeding.
一名州警拦下了超速行驶的汽车。
州警；州警察
先理解核心含义，再看它在真实句子里的用法。
州警；州警察
a state police officer
A state trooper stopped the car for speeding.
一名州警拦下了超速行驶的汽车。
骑兵或装甲兵中的列兵。
A soldier of private rank in cavalry or armor.
战马；军马。
A cavalry horse; a charger.
士兵。
A soldier.
The state trooper pulled over the speeding car on the interstate.
州警在州际公路上拦下了超速的汽车。
A trooper on horseback kept watch over the festival crowd.
一名骑警骑着马在节日人群旁警戒。
Two troopers helped clear the debris from the accident.
两名州警帮忙清理了事故现场的碎片。
在美国，trooper 常特指州警（state trooper）。
A state trooper stopped the car for speeding.
一名州警拦下了超速行驶的汽车。
指人时，定语从句常用关系代词 who。
The trooper who helped us was very kind.
帮助我们的那名州警非常友善。
复数形式 troopers 可泛指州警这一群体。
Troopers patrol the highways day and night.
州警日夜在高速公路上巡逻。
Not this
She is a state police.
Use this
She is a state trooper.
汉语中的“警察”既可以指机构也可以指个人，但英语 police 是集合名词，不能与 a 连用表示一个人。表示一名州警时要用可数名词 trooper。
Not this
The trooper are questioning the driver.
Use this
The troopers are questioning the driver.
trooper 是可数名词，主语为复数时名词要用复数形式 troopers，动词也要用 are。汉语没有名词复数变形，所以学习者容易漏掉 -s。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
州警察；州警
A state trooper stopped the speeding car on the highway.
一名州警察在高速公路上拦下了超速的汽车。
公路巡逻警察；高速公路巡警
She was the first woman to serve as a highway patrol trooper in her county.
她是该县第一位担任公路巡逻警察的女性。
州警制服
He put on his trooper uniform and reported for duty.
他穿上州警制服去报到上班。
州警巡逻车；警车
The trooper car pulled over to help a driver with a flat tire.
州警巡逻车停下来帮助一位轮胎漏气的司机。
满口脏话；破口大骂
He swears like a trooper when things go wrong.
事情出问题时，他不停地说脏话。
拼命工作；像士兵一样努力工作
She worked like a trooper to get everything ready in time.
她拼命工作，争取按时把一切准备好。
是个坚强可靠的人
The kids were real troopers during the long hike.
孩子们在长途徒步中表现得非常坚强。
州警察先生，请别拦下我。
She drove carefully because she saw a state trooper on the highway.
她在高速公路上看见州警，于是小心翼翼地开车。
哦，哦，哦，哦，骑兵！
The Iron Maiden song 'The Trooper' is inspired by the Charge of the Light Brigade.
铁娘子乐队的歌曲《骑兵》灵感来自轻骑兵旅的冲锋。
Use trooper naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 troop（队伍）+ -er：trooper 是队伍中的一员。想象一名州警骑马随队巡逻，trooper 就是那位骑警。
语域：neutral 常见场景：美国州警报道、骑警巡逻 trooper 通常指美国州警，也可指骑警；常见于新闻报道、警务相关文本和日常提及，整体为中性词。
Genuine rhymes with -uːpə: snooper, scooper, hooper, looper, and trouper (which is a homophone of trooper). Super also ends in the same sound in British non-rhotic pronunciation (/ˈsuːpə/), but in General American it ends in /pər/, so it does not rhyme there. Lookalikes to avoid: proper (/ˈprɒpə/) and trophy (/ˈtrəʊfi/) look similar but sound different; troop (/truːp/) shares the base but lacks the final /ə/.
Dictionary facts from ECDICT, WIKTIONARY.