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1. | Mental age |
| 心理年龄 |
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2. | developmental age |
| 发育年龄;发展年龄 |
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3. | the military age; the conscription age |
| 兵役年龄 |
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4. | age determination |
| 年龄测定 |
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5. | universal age |
| 宇宙年龄 |
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6. | age differences |
| 年龄差异 |
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7. | element age |
| 元素年龄 |
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8. | age composition |
| 年龄构成 |
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9. | impact age |
| 撞击年龄 |
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10. | evolutionary age |
| 演化年龄 |
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