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41. | convertible terms |
| 同义语,可代换用语 |
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42. | dynamic equivalent of masses |
| 质量的动代换 |
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43. | multiple substitution enciphering system |
| 多次代换编码系统 |
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44. | simultaneous unifiers |
| 联立一致化代换式 |
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45. | modular substitution |
| 模变换|模代换 |
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46. | transformed substitution |
| 变换了的代换 |
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47. | isotopically exchangeable phosphat |
| 同位素代换的磷酸盐 |
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48. | import substitute and export substitute |
| 进口替代与出口替代 |
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49. | conjugate groups of linear substitutions |
| 共轭线性代换群 |
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50. | overseas discharge and replacement depot |
| 海外卸货及代换站 |
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