cordons
n.
警戒线，警戒圈( cordon的名词复数 );
例句:
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Demonstrators attacked police cordons with sticks and assorted missiles.
示威者用棍棒和各种投射物向警察的封锁线进攻.
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Officers beat back protesters with batons as they tried to break the police cordons to join the main demonstration.
来自BBC
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He says before the revolution, the police used to intervene, establishing cordons and proper security at the entrances.
来自VOA
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Two helicopters hovered overhead while uniformed officers stood guard at cordons on the surrounding roads.
来自THETIMES