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41. | circumscribed circle |
| 外接圆|外切圆 |
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42. | relative circle |
| 相对圆 |
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43. | diffusion circle |
| 扩散圈 |
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44. | asymptotic circle |
| 渐近圆 |
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45. | airscrew circle |
| 螺旋桨盘面圆 |
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46. | director circle |
| 切距圆|准圆 |
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47. | Apolloniu's circle |
| 阿波罗尼圆 |
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48. | quality circle |
| 质量圈 |
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49. | approximate circle |
| 近似圆 |
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50. | typological circle |
| 类型圈(文体) |
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