And then they double-checked by doing some more radioactive uranium and electron spin resonance dating on a fossilized tooth, which gave an estimate of 286,000 years.

然后，他们通过对一颗牙齿化石进行一些更具放射性的铀和电子自旋共振测年来进行复核，估计其存在时间为 286,000 年。