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| 41. | collecting optics |
| 会聚光学 |
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| 42. | convergence measurement |
| 会聚测量 |
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| 43. | convergence pressure |
| 会聚压力 |
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| 44. | convergence of rays |
| 光线会聚 |
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| 45. | converging action |
| 会聚作用 |
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| 46. | horizontal convergence |
| 水平会聚 |
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| 47. | converging bundle |
| 会聚束 |
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| 48. | drift of convergence |
| 会聚漂移 |
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| 49. | converging streams |
| 会聚流 |
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| 50. | convergence system |
| 会聚系统 |
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