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| 21. | perimeter heating |
| 周边供热 |
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| 22. | pitch circumference |
| 节圆周长 |
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| 23. | (in measurements)following the circumference |
| （度量）周长 |
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| 24. | perimeter track |
| 环形滑行道 |
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| 25. | cushion periphery |
| 气垫周长 |
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| 26. | perimeter barrier |
| 外围屏障；周界屏障 |
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| 27. | ten miles in circumference |
| 周长十英里 |
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| 28. | wetted perimeter |
| 湿润周界 |
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| 29. | building perimeter |
| 建筑物总长度 |
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| 30. | projection perimeter |
| 投射式视野计 |
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