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| 51. | collecting pump |
| 收集泵 |
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| 52. | sample collection |
| 试样收集 |
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| 53. | seed collection |
| 种子收集 |
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| 54. | collection efficiency |
| 收集效率 |
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| 55. | Open Collection |
| 打开收集 |
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| 56. | collect some article |
| 收集文章 |
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| 57. | waste collection |
| 废物收集 |
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| 58. | collection coefficient |
| 收集系数 |
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| 59. | litter collection |
| 收集垃圾 |
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| 60. | collection of sewage |
| 收集污水 |
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