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| 41. | Ornithological Biography |
| 鸟类生活史 |
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| 42. | a bird [an animal] sanctuary |
| 鸟类保护区 |
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| 43. | migration of birds |
| 鸟类迁徙 |
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| 44. | avian morphology |
| 鸟类形态学 |
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| 45. | ornithological anatomy |
| 鸟类解剖学 |
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| 46. | specimen of birds |
| 鸟类标本 |
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| 47. | ornithological ecology |
| 鸟类生态学 |
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| 48. | avian leukemia virus |
| 鸟类白血病病毒 |
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| 49. | avian pathology |
| 鸟类病理学 |
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| 50. | marine birds |
| 海洋鸟类 |
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