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| 81. | isotopic dating |
| 同位素测定年龄 |
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| 82. | minimum age for employment |
| 最低就业年龄 |
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| 83. | peak age of crime |
| 犯罪高峰年龄 |
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| 84. | fermi age equation |
| 费米年龄方程 |
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| 85. | absolute dating |
| 绝对年龄测定 |
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| 86. | geologic dating |
| 地质年龄测定 |
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| 87. | birth rate by ages |
| 年龄差别出生率 |
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| 88. | lunar time scale |
| 月年龄表 |
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| 89. | size age confusion |
| 体型年龄混乱 |
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| 90. | rubidium strontium age |
| 铷 锶年龄 |
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