壳型花岗岩具较高的铅同位素比值和富铀铅贫钍铅的特点；

The crust granites have higher lead isotope ratios and are richer in uranium lead but poorer in thorium lead.

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把钋或者钍放在,开一个小口的含铅的盒子里面。

So, you've got polonium or thorium sitting inside this leaded box with one opening.

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自不稳定核之间存在着锕系元素，包括钍和稳定核像灌了铅，铋，爆炸性事件，如超需出示锕。

Since the unstable nuclei exist between actinides, including thorium and stable nuclei like lead and bismuth, explosive events such as supernovae are required to produce actinides.

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So, you've got polonium or thorium sitting inside this leaded box with one opening.

把钋或者钍放在,开一个小口的含铅的盒子里面。

麻省理工公开课 - 固态化学导论课程节选