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| 51. | synthetic natural gas |
| 合成天然气 |
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| 52. | A colorless crystalline compound, NH2OH, explosive when heated, that is used as a reducing agent and |
| 羟胺一种无色的结晶化合物，NH2OH，加热时会爆炸，用作还原剂以及用在有机合成中 |
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| 53. | irrational synthesis |
| 非示构合成|非有理合成 |
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| 54. | speech synthesis |
| 语音合成 |
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| 55. | The manufacture of polyurea polyol( PHD) is so complex that the preparation of title compound is difficult |
| 聚脲多元醇PHD的生产工艺复杂,在普通实验室和工厂合成较为困难。 |
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| 56. | synthetic species |
| 合成种 |
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| 57. | A composition; a mixture. |
| 混合；合成 |
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| 58. | Synthetic Threads |
| 合成线 |
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| 59. | synthetic adhesive |
| 合成胶粘剂 |
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| 60. | synthetic drugs |
| 合成药物 |
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