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| 21. | security on the move |
| 行军警戒 |
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| 22. | emergency alert |
| 紧急警戒 |
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| 23. | an outpost area |
| 警戒地带 |
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| 24. | Warning receiver |
| 警戒接收机 |
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| 25. | alerting information |
| 警戒情报 |
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| 26. | Alert Phase [ALERFA] |
| 警戒阶段 |
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| 27. | destroyer screen |
| 驱逐舰警戒 |
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| 28. | keep watch |
| 担任警戒 |
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| 29. | vigilance pushbutton |
| 警戒按扣 |
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| 30. | on the alert; on the look-out |
| 警戒着 |
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