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| 21. | Chinese perimeter wall |
| 中式围墙 |
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| 22. | perimeter protection |
| 外围保安；周界保安 |
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| 23. | basin perimeter |
| 流域周长；流域周界 |
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| 24. | minefield perimeter marker |
| 雷场周边标志 |
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| 25. | perimeter defence system |
| 外围防护系统 |
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| 26. | perimeter array antenna |
| 环形阵列天线 |
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| 27. | airport perimeter fencing |
| 机场周边围网 |
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| 28. | perimeter of deck |
| 甲板周边 |
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| 29. | perimeter acquisition radar |
| 环形搜索雷达 |
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| 30. | perimeter of airway |
| 风巷周长 |
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