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| 1. | If adult mortality was also high for any reason— because of inadequate nutrition, lack of water or overhunting |
| 这时候如果因为营养不良、份不足或是过度猎捕等原因，使得成驴的死亡率偏高，族群数量就会下降到一个临界点，此时要回复到原本的数量不但困难，甚至会是不可能的。 |
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| 2. | Because of his poor nutrition, he has grown weaker and weaker |
| 他因为营养不良,身体越来越虚弱 |
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| 3. | Because of his poor nutrition, he have grow weaker and weaker. |
| 他因为营养不良,身体越来越虚弱。 |
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| 4. | Poor nutrition because of an insufficient or poorly balanced diet or faulty digestion or utilization |
| 营养不良由于食量不足或食物结构不平衡、消化不良或食物吸收不良而引起的营养匮乏 |
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