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| 71. | cross breeding experiment |
| 杂交繁殖实验 |
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| 72. | Rabbits breed very quickly. |
| 兔子繁殖非常快。 |
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| 73. | intravarietal breeding |
| 品种内繁殖 |
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| 74. | pre-reproductive age |
| 繁殖前年龄 |
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| 75. | biological thremmatology |
| 生物繁殖学 |
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| 76. | cow-and-calf system |
| 繁殖母牛制 |
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| 77. | accessory reproduction |
| 副繁殖作用 |
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| 78. | propagation of tea cuttings |
| 茶树插条繁殖 |
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| 79. | post-reproductive age |
| 繁殖后期年龄 |
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| 80. | Rabbits multiply quickly. |
| 兔子繁殖很快。 |
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