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| 51. | trisubstitution product |
| 三取代产物 |
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| 52. | substituted benzene |
| 取代苯 |
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| 53. | substitutional defect |
| 取代缺陷 |
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| 54. | para-orienting group |
| 对位取代基 |
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| 55. | China has replaced the US as Japan's top trade partner, as Beijing has emerged as a global economic powerhouse. |
| 随着中国世界经济大国地位的确立，中国已取代美国成为日本的最大贸易伙伴。 |
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| 56. | partially substituted cellulose acetate fibre |
| 低取代醋酸纤维 |
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| 57. | The act of displacing. |
| 移开，取代，免职 |
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| 58. | angular substituents |
| 角取代基 |
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| 59. | be superseded by |
| 为￥取代 |
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| 60. | nucleophilic substitution |
| 亲核取代 |
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