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| 41. | nucleophilic substitution |
| 亲核取代 |
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| 42. | The act of displacing. |
| 移开，取代，免职 |
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| 43. | be superseded by |
| 为￥取代 |
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| 44. | aromatic substitutio |
| 芳族取代 |
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| 45. | partially substituted cellulose acetate fibre |
| 低取代醋酸纤维 |
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| 46. | para-orienting group |
| 对位取代基 |
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| 47. | trisubstitution product |
| 三取代产物 |
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| 48. | allylic substitution |
| 烯丙取代 |
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| 49. | angular substituents |
| 角取代基 |
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| 50. | olefin(e)-substituted aromatic |
| 烯烃取代芳香烃 |
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