... trace concentrations微量浓度 trace determaination微量测定 tracer diffusion示踪扩散 ...
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这些矿物可以用放射性衰变技术测定年代，因为它们所含的放射性微量元素非常少。
These minerals can be dated by radioactive decay techniques because of the very small quantities of radioactive trace elements they, in turn, contain.
总共有485块锆石内部带有包体，其中有十几块包体中含有放射性微量元素，研究者可以根据它们来测定包体的年代。
A total of 485 zircons held inclusions, and about a dozen or so of these contained radioactive trace elements that allowed the researchers to determine their ages.
之前，一项称为微量分光光度测定法的技术显示，鲨鱼的近亲鳐鱼和奇美拉都有辨色能力。
A technique known as microspectrophotometry had previously shown that rays and chimaeras, both close relatives of sharks, have color vision.
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