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| 21. | symmetrical repetition |
| 对称重复 |
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| 22. | symmetrical ignorance |
| 对等的无知 |
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| 23. | symmetrical lens |
| 对称透镜 |
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| 24. | symmetrical transistor |
| 对称晶体管 |
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| 25. | symmetrical load |
| 对称荷载 |
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| 26. | symmetrical quadripole |
| 对称四端网络 |
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| 27. | symmetrical mirror |
| 对称镜 |
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| 28. | symmetrical section |
| 对称状分段 |
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| 29. | symmetrical profiling |
| 对称剖面法 |
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| 30. | symmetrical wave |
| 对称波 |
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