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| 71. | questioning age |
| 好问年龄 |
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| 72. | age determination |
| 年龄测定 |
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| 73. | radiocarbon age |
| 放射性碳(的年)龄 |
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| 74. | radioactive age |
| 放射性年龄 |
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| 75. | evolutionary age |
| 演化年龄 |
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| 76. | phanerozoic age |
| 显生期 |
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| 77. | archaeotectonic age |
| 古构造年龄 |
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| 78. | radiometric age |
| 绝对年龄 |
|
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| 79. | Magdalenian age |
| 【古】马格达连时代 |
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| 80. | astronomical age |
| 天文年龄 |
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