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31. | antitank security |
| 反坦克警戒 |
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32. | signalling prop |
| 警戒木柱 |
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33. | deterrent measure |
| 警戒措施 |
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34. | The caution is stern. |
| 警戒森严。 |
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35. | guarding troops; outpost troops; troops on alert |
| 警戒部队 |
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36. | sentinel behavior |
| 警戒行为 |
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37. | Warning radar |
| 警戒雷达 |
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38. | antigas security |
| 防毒警戒 |
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39. | strongpoint security |
| 据点警戒 |
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40. | d control antenna system |
| 警戒引导雷达天线;警戒引导雷达天线 |
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