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- 警方时时警戒终有所获。
Police's vigilance was eventually rewarded.
- 核武装轰炸机在危机期间负责警戒
Nuclear-armed bombers were put on alert during the crisis.
- 侦探们又开始在那楝房子警戒了。
The detectives resumed their vigil at the house.
- 尽管警戒很严，北极熊还是逃出了动物园。
In spite of vigilance a polar bear escape from the zoo.
- 他们知道有发生危险的可能，就特别加强警戒。
Knowing that danger threatened, they kept an extra careful watch.
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