元素钍 meaning in Chinese

I was struck by the fact that the activity of uranium and thorium compounds appears to be an atomic property of the element uranium and of the element thorium
我突然意识到，铀化合物和针化合物的这些活性似乎是元素铀和元素钍的原子属性。
Their discovery marks the first abundance determination of the actinides element thorium in a star beyond the milky way , and follows the detection of thorium in more than ten stars within the milky way
他们发现,标志着首丰测定的锕系元素钍星以外的银河系,跟检测钍十余恒星的银河系