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| 51. | double replacement |
| 双重取代|互换 |
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| 52. | alien substitution line |
| 外来取代品系 |
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| 53. | side substitution |
| 侧链取代 |
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| 54. | eletronegative substituent |
| 电负性取代基 |
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| 55. | chain substitution |
| 链上取代 |
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| 56. | None can take the place of you. |
| 无人能取代你。 |
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| 57. | negative substituent |
| 阴性取代基 |
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| 58. | disubstitution product |
| 双取代物 |
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| 59. | directing group |
| 定向取代基 |
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| 60. | elimination of group |
| 消去取代基 |
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