Because they rely on estimation, relative techniques like stratigraphy are considered less precise than absolute techniques, like radiocarbon dating or verification from written records.
因为他们象地层学那样依赖相关的技术进行推测，其精确度不如用放射性碳元素断定或根据记录来断定年代的方法。
Because they rely on estimation, relative techniques like stratigraphy are considered less precise than absolute techniques, like radiocarbon dating or verification from written records.
因为他们象地层学那样依赖相关的技术进行推测，其精确度不如用放射性碳元素断定或根据记录来断定年代的方法。
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