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| 41. | effective circumference |
| 有效圆周长 |
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| 42. | perimeter frame |
| 边框式车架 |
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| 43. | perimeter protection |
| 外围保安；周界保安 |
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| 44. | datum circumference |
| 基准圆周长 |
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| 45. | is an enclosed area, with walls about fourteen metres high, six metres thick and four kilometres in perimeter |
| 山海关城墙高约14米，宽6米多，周长4千米，整座城楼与长城相连。 |
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| 46. | outer circumference |
| 外圆周长 |
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| 47. | A500 metre perimeter has been cordoned off around the hole. |
| 这个地洞周长长达500米。有关当局怀疑地洞的出现是由于事发地有异常情况发生。 |
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| 48. | Armhole Girth |
| 袖窿周长 |
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| 49. | the girth of a tree trunk |
| 树干的周长 |
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| 50. | An algorithm, fast and precise, is introduced to calculate area, perimeter, compactness and extracting |
| 提出了一种图像中目标轮廓线的提取技术和目标面积、周长、简缩比的算法,具有速度快,精度高的优点。 |
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