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.

如果这个表面实际上是化石，研究人员可以通过射性测年法辨别出年龄。

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.

但是，即使利用射性测定年代法，即后来所谓衰变计算法，也要等几十年以后我们才得出地球真正年龄大约是在10亿年以内。