A cordon is a line of police officers, soldiers, or vehicles placed around a place to keep people out — or sometimes to keep people in. After a crash, a fire, or a crime, the police may put a cordon around the street.

A cordoncordon(封鎖線) is a line of police officers, soldiers, or vehicles是一排警察、軍人，或車輛 placed around a place圍在一個地方周圍 to keep people out用來擋住人不讓進去 — or有時 sometimes to keep people in也用來把人留在裡面。After a crash, a fire, or a crime發生車禍、火災，或犯罪案件之後, the police may put a cordon around the street警察可能會在街道周圍拉起封鎖線。

The usual verb is to cordon something off: they cordoned off the square. The ring can be made of people, cars, tape, or a mix; what matters is the closed line, not what it is made of.

The usual verb常用的動詞是 is to cordon something off'cordon...off', they cordoned off the square像'they cordoned off the square'(他們封鎖了那個廣場)。The ring可以圍成那圈的東西 can be made of people, cars, tape, or a mix可以是人、車、封鎖膠帶，或混在一起; what matters重要的是 is the closed line那條封閉的線, not what it is made of而不是它是用什麼做的。

It is a news word, a bit formal. An officer in the street might just say stay back. The paper will say a police cordon.

It is a news word它是新聞用語, a bit formal有點正式。An officer in the street街上的警察 might just say可能只會說 stay back'退後'。The paper報紙 will say會寫 a police cordon'警方拉起封鎖線'。

The word comes from an old French word for a small cord, sitting in the same family as English cord — a thin line that hems something in.

The word這個字 comes from an old French word for a small cord源自法文一個指小繩子的舊字, sitting in the same family as English cord跟英文的cord(繩子)是同一個字源家族 — a thin line that hems something in意思是一條圍住某樣東西的細線。