Airport Public Security Bureau immediately sent the police to maintain order at the scene, set up a cordon.
机场公安局立即派警力维护现场秩序，设置了警戒线。

With slow but purposeful movements the shadow stole forward until it was finally outside the police cordon.
那黑影子用了缓慢的然而坚定的动作，终于越过了警戒线。

Very cautiously she slipped through the police cordon and made her way stealthily towards Chen Yuehngo's hut.
她很小心地越过了警戒线，悄悄地到了陈月娥住的草棚左近。

Within two kilometers around the venue, the police cordon set up three from the ground to the air, 24hour alert.
后来法庭决定将警戒线范围缩小至距离围栏200米处。

At the same time, the national police continued to conduct search and cordon operations to confiscate illegal arms.
与此同时，国家警察继续开展搜查和封锁行动，没收非法武器。

Reflection on the Cordon of China's Government Debt at the Present Stage; and Precautions to be Taken against Debt Risks.
现阶段我国政府债务警戒线的反思及债务风险的防范