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| 31. | perimeter-to-cross section ratio |
| 周长-截面比 |
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| 32. | perimeter patrol officer |
| 外围巡逻员 |
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| 33. | airport perimeter route |
| 机场周边信道 |
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| 34. | the perimeter of a airfield |
| 机场周围 |
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| 35. | perimeter planter wall for... |
| 环绕……的花槽围墙 |
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| 36. | the perimeter of a rectangle; |
| 一个矩形的周长； |
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| 37. | outer perimeter warning screen |
| 外层环形雷达警戒网 |
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| 38. | set guards around the perimeter. |
| 派守卫于防御带周围 |
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| 39. | (perimeter acquisition radar) |
| 环形探测雷达 |
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| 40. | barbed wired coils on perimeter fences |
| 铁丝网刺钩 |
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