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| 51. | How many meters is its perimeter? How many square meters is its area? |
| （2） 公园里有一个圆形的花坛，它的直径是8米，周长是多少米？面积是多少米？ |
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| 52. | perimeter of deck |
| 甲板周边 |
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| 53. | perimeter defence system |
| 外围防护系统 |
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| 54. | perimeter patrol officer |
| 外围巡逻员 |
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| 55. | airport perimeter fencing |
| 机场周边围网 |
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| 56. | Chinese perimeter wall |
| 中式围墙 |
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| 57. | perimeter acquisition radar |
| 环形搜索雷达 |
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| 58. | minefield perimeter marker |
| 雷场周边标志 |
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| 59. | perimeter array antenna |
| 环形阵列天线 |
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| 60. | airport perimeter route |
| 机场周边信道 |
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