long-lived element 长寿命元素
By analyzing ratios of isotopes — variations of the same element with a different mass - he can learn things about the environment they lived in, such as temperature and salinity.
通过分析其中的同位素(同一种元素拥有不同的质量)比例，他可以了解这些菊石所生活的环境特征，如温度和盐度。
A radioactive transuranic element in the actinide series, artificially produced in trace amounts. Its longest-lived isotope is No255 with a half-life of3 minutes. Atomic number102.
锘在锕类元素中的一种放射性超铀元素，人工微量制造，其最长寿命的同位素是锘255，其。
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