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cordon sth off
cordon off 是短语动词；宾语为名词时可在 off 前后，代词宾语则必须放在 off 之前。
The police cordoned the area off after the explosion.
爆炸发生后，警方用警戒线封锁了该区域。
警戒线；封锁线
cordons — plural of cordon
先理解核心含义，再看它在真实句子里的用法。
警戒线；封锁线
a line or series of police, sentinels, or military posts that guards or encloses a place or area
The police cordoned the area off after the explosion.
爆炸发生后，警方用警戒线封锁了该区域。
指由警察或军队设置、禁止通行的警戒圈或警戒线。
围绕某区域以封闭或保护它的一排人或物。
A line of people or things placed around an area to enclose or protect it.
板球中,击球手后方场外侧的守场员弧形站位,包括 slips 和 gully。
The arc of fielders on the off side, behind the batsman: the slips and gully.
木本植物(如果树),单茎修剪整形并依附支撑物生长。
A woody plant, such as a fruit tree, pruned and trained to grow as a single stem on a support.
The police placed a cordon around the building after the alarm went off.
警报响起后，警察在大楼周围设置了警戒线。
No one can enter the area because the soldiers have set up a cordon.
由于士兵们设置了封锁线，任何人不得进入该区域。
The crowd was kept behind the cordon while firefighters worked.
消防员工作时，人群被挡在警戒线后面。
cordon off 是短语动词；宾语为名词时可在 off 前后，代词宾语则必须放在 off 之前。
The police cordoned the area off after the explosion.
爆炸发生后，警方用警戒线封锁了该区域。
被动式强调封锁状态，常见于新闻报道。
The building was cordoned off for safety reasons.
出于安全原因，该大楼被警戒线封锁。
A cordon of police stopped the demonstrators.
一道警察警戒线阻止了示威者。
Not this
Police formed cordon around the building.
Use this
Police formed a cordon around the building.
cordon 作“警戒线”讲是可数名词，前面需要不定冠词 a；中文“设置警戒线”没有冠词，所以容易漏掉 a。
Not this
Police cordoned around the building.
Use this
Police cordoned off the building.
cordon 作动词表示“用警戒线围住”时，常与 off 构成短语动词直接接宾语；不能把 around 当作状语放在动词后。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
封锁；用警戒线围住
The police cordoned off the area after the explosion.
爆炸发生后，警方封锁了该地区。
警方警戒线
The police cordon was set up to keep the crowd away.
警方设置了警戒线以疏散人群。
安全警戒线
A tight security cordon surrounded the conference center.
会议中心周围设置了严密的安全警戒线。
形成警戒线
Police formed a cordon to prevent the protesters from advancing.
警察组成警戒线，阻止抗议者前进。
冲破警戒线
Some demonstrators tried to break through the cordon.
一些示威者试图冲破警戒线。
蓝带（指顶级烹饪或厨师）
She is a cordon bleu chef.
她是一位蓝带厨师。
隔离带；防疫线（常比喻政治隔离）
Western governments tried to set up a cordon sanitaire around the military junta.
西方政府试图在军政府周围建立隔离带。
Use cordons naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
拼写里有 cord（绳子）——想象警察用绳带拉起警戒线，cordon 就是那条线。
语域：neutral 常见场景：news reports、police or military operations cordon 作名词指警戒线、封锁线，作动词指用警戒线围住，通常用于新闻报道或警方/军事行动场景，语体偏中性或正式；动词常见形式为 cordon off。
真韵脚：warden（ˈwɒːdən/ˈwɔːdən）与 cordon 的重读元音及后续读音相同；cord 的前段读音与 cordon 相同，但少一个音节。注意 lookalikes：garden 的 ar 读 /ɑː/，不押韵；don 单独读 /dɒn/，而在词尾的 -don 常弱读为 /dən/，如 pardon、London。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY.