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| 21. | recovery of ova |
| 收集卵子 |
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| 22. | collecting mania |
| 收集狂 |
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| 23. | collection system |
| 收集系统 |
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| 24. | collection of data |
| 收集数据 |
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| 25. | bulk milk collection |
| 收集牛乳 |
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| 26. | variety collection |
| 品种收集 |
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| 27. | nightsoil collection |
| 人粪尿收集 |
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| 28. | antique collecting | antiquarianism |
| 古玩收集 |
|
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| 29. | bookmark collecting |
| 书签收集 |
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| 30. | refuse collection |
| 垃圾收集 |
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