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| 41. | carbon dioxide system |
| 二氧化碳体系 |
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| 42. | system of psychology |
| 心理学体系 |
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| 43. | architectural characteristics |
| 体系特性 |
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| 44. | protection forest system |
| 防护林体系 |
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| 45. | borate salt system |
| 硼酸盐体系 |
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| 46. | The Exchange System |
| 交换体系 |
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| 47. | geocentric system |
| 地心体系 |
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| 48. | multivariant system |
| 多变体系 |
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| 49. | water supplying system |
| 供水体系 |
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| 50. | ecological systems |
| 生态体系 |
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