警戒線的用法和樣例：
例句
-
他開槍射擊突破警察的警戒線。
He shot his way through the police cordon. -
其中一個持槍人突破了總統住房周圍的警戒線。
One of these gunmen pierce the protective cordon around the president's house. -
示威群眾突破了警戒線。
Demonstrators broke through the police cordon. -
警方的警戒線阻擋不住人群。
The police cordon was unable to hold back the crowd.
