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51. | exploit the urBan and rural markets |
| 开拓城乡市场 |
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52. | non-ramified extension |
| 非分歧开拓 |
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53. | extended point transformation |
| 开拓点变换 |
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54. | surface development of deposit |
| 矿床露天开拓 |
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55. | analytic prolongation in the wider sense |
| 广义解析开拓 |
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56. | stepwise extension |
| 按步开拓 |
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57. | analytically continued |
| 解析开拓的 |
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58. | Cultural Expansion Company |
| 文化开拓公司 |
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59. | deep level development |
| 深部水平开拓 |
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60. | minimal closed extension |
| 最小闭开拓 |
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