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| 31. | recovery of ova |
| 收集卵子 |
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| 32. | collecting mania |
| 收集狂 |
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| 33. | collection system |
| 收集系统 |
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| 34. | collection of data |
| 收集数据 |
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| 35. | bulk milk collection |
| 收集牛乳 |
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| 36. | variety collection |
| 品种收集 |
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| 37. | nightsoil collection |
| 人粪尿收集 |
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| 38. | antique collecting | antiquarianism |
| 古玩收集 |
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| 39. | bookmark collecting |
| 书签收集 |
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| 40. | refuse collection |
| 垃圾收集 |
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