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81. | economic investigation |
| 经济调查 |
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82. | institute an inquiry into |
| 开始调查 |
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83. | a preliminary investigation; |
| 事先调查; |
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84. | initial inquiry |
| 初次调查 |
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85. | An investigation; an inspection. |
| 调查;查看 |
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86. | forest inventory |
| 森林资源调查 |
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87. | survey of main units |
| 重点调查 |
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88. | exhaustive survey |
| 彻底调查 |
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89. | extensive exploration |
| 广泛调查 |
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90. | inquiry about market information |
| 市场信息调查 |
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