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| 51. | survey of main units |
| 重点调查 |
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| 52. | household survey |
| 家计调查 |
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| 53. | temperament survey |
| 气质调查 |
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| 54. | forest inventory |
| 森林资源调查 |
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| 55. | epidemiological survey |
| 流行病学调查 |
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| 56. | An investigation; an inspection. |
| 调查；查看 |
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| 57. | institute an inquiry into |
| 开始调查 |
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| 58. | extensive exploration |
| 广泛调查 |
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| 59. | a preliminary investigation; |
| 事先调查; |
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| 60. | economic investigation |
| 经济调查 |
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