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21. | Convergence service |
| 会聚服务 |
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22. | convergent mirror |
| 会聚镜 |
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23. | convergent phenomena |
| 会聚现象 |
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24. | convergent control system |
| 会聚控制系统 |
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25. | convergent photograph |
| 会聚相片 |
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26. | beam convergence |
| 电子束会聚 |
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27. | field convergence |
| 场会聚 |
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28. | convergent channe |
| 会聚槽 |
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29. | focusing distance |
| 会聚距离 |
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30. | convergent development |
| 会聚发育 |
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