And remember, zircons are also used in radiometric dating.

请记住，锆石也用于辐射 测年。

If this surface is in fact fossilized lava flow, researchers may discern the lake's age, thanks to radiometric dating.

如果面实际上化石熔岩流，研究人员可以通过射性测年法辨别出该湖的年龄。

But even with radiometric dating, as decay measurements became known, it would be decades before we got within a billion years or so of Earth's actual age.

但，利用射性测定年代法，后来所谓的衰变计算法，也要等几十年以后我们才得出地球的真正年龄大约在10亿年以内。