1·After four years' hard work and refinement of tons of pitchblende, Marie and her husband at last saw the dim blue light of the new element-radium.
四年的辛勤工作和提炼了大量的沥青铀矿，玛丽和她的丈夫终于看到了发出暗蓝色微光的新元素——镭。
2·The radiometric age of pitchblende is 109-108 m.
沥青铀矿的同位素年龄为108—109百万年。
3·The initial lead in pitchblende belongs to radioactive origin from crust.
沥青铀矿中的初始铅属地壳放射成因。