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| 31. | age composition |
| 年龄构成 |
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| 32. | impact age |
| 撞击年龄 |
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| 33. | age at sexual maturity |
| 性成熟年龄 |
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| 34. | basal year level |
| 基础年龄 |
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| 35. | age differences |
| 年龄差异 |
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| 36. | Mental age |
| 心理年龄 |
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| 37. | age of menarche |
| 初潮年龄 |
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| 38. | age determination |
| 年龄测定 |
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| 39. | age of remanence |
| 剩磁年龄 |
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| 40. | intermediate ages |
| 中间年龄 |
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