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51. | A natural principle |
| 自然之理 |
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52. | genuine luster |
| 色泽自然 |
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53. | act contrary to nature |
| 违反自然 |
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54. | Spontaneous aggregation |
| 自然聚合 |
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55. | (in) natural colors |
| 色彩自然 |
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56. | Natural monopoly |
| 自然垄断 |
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57. | native gold |
| 自然金 |
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58. | To let it take its own course |
| 听任自然 |
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59. | the school of natural law |
| 自然学派 |
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60. | natural region |
| 自然区 |
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