名词
中文翻译：裂变径迹年龄
同义词：
['fission track ages', 'fissiontrack ages']
例句：
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1. Theage of the Earth's crust isestimated to be about 4.5billion years old.
地球地壳的年龄估计约为45亿年。
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2. Theage of the oldest knownmeteorite is estimated tobe around 4.5 billionyears.
已知最古老的陨石的年龄估计约为45亿年。
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3. The age of theEarth's crust is a key factorin understanding its geological history.
地球地壳的年龄是理解其地质历史的关键因素。