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| 11. | A closed plane figure bounded by three or more line segments. |
| 多边形；多角形由三条或更多的线段围成的一个封闭的平面图形 |
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| 12. | A city park that was bounded by busy streets. |
| 被拥挤街道所包围的城市公园 |
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| 13. | A half of a sphere bounded by a great circle. |
| 半球一个巨大圆周所包围的球体的一半 |
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| 14. | The figure bounded by and containing the area between two concentric circles. |
| 圆环域以两个同心圆为界的图形或两圆之间包括的图形 |
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| 15. | The area enclosed or bounded by an angle formed in this manner. |
| 以这种方式形成的角度所包围或限制的地方. |
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| 16. | The plane area bounded by such an arc and two perpendicular radii. |
| 四分之一圆，扇形体由九十度弧与两条垂直的半径围成的平面图形 |
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| 17. | The airfield is bounded by woods on all sides. |
| 飞机场的四周都是树林. |
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| 18. | Leg: A part of the course bounded by two marks or buoys. |
| 站：航行路线的一部分，在两个浮标或标记之间。 |
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| 19. | a parallelepiped bounded by six similar faces (either rhombuses or parallelograms). |
| 有六个面的平行四面体（或是棱形的或是平行四边形的）。 |
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| 20. | a solid figure bounded by a spherical surface (including the space it encloses). |
| 被球面限制范围的固体轮廓（包括内部空间）。 |
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