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| 81. | Guards patrolled the perimeter of the airfield. |
| 卫兵沿机场四周巡逻. |
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| 82. | different wheels, depicting spokes with lines that curved, bent, waved, dashed and extended beyond the perimeter |
| 为了找到这些答案，我创作了5幅不同轮子的凸起线条画，用不同的线条表示轮辐：弧形、形、浪形、线形和在轮子周长之外延伸形。 |
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| 83. | Setting wheel circumference, selection of metric or British unit. |
| 设置车轮周长，选择公制或英制。 |
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| 84. | wetted perimeter of flow cross section |
| 湿周 |
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| 85. | orbital speed due to the eccentricity of its orbit: this allows us to see up to about6° more along its perimeter |
| 振动主要地由月亮所引起正在由于它的轨道的古怪改变轨道的速度:这让我们沿着它的周长见到达大约6°更多。 |
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| 86. | barbed wired coils on perimeter fences |
| 铁丝网刺钩 |
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| 87. | The circuit of the city walls is three miles. |
| 环绕本市城墙的周长是叁英里. |
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| 88. | The earth's circumference is more than 40000 kilometres. |
| 地球的周长为四万多公里。 |
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| 89. | The trees are bushing out sideways. |
| 这些树正往四周长杈。 |
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| 90. | The ratio of circumference to diameter is approximately 3.1416. |
| 圆周长与直径的比大约是3.1416。 |
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