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| 11. | a state of alert |
| 警戒状态 |
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| 12. | keep a sharp look-out |
| 严密警戒 |
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| 13. | have one's eyes wide open; be careful |
| 监视;警戒 |
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| 14. | screening aircraft |
| 警戒飞机 |
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| 15. | keep guard |
| 实行警戒 |
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| 16. | radio communication guard |
| 无线电通信警戒 |
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| 17. | To strengthen the caution |
| 增强警戒 |
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| 18. | security surveillance |
| 警戒网 |
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| 19. | guard command set |
| 警戒命令集 |
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| 20. | aposematic mimicry |
| 警戒拟态 |
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