The radon and its daughterelements are the decay products of the radioactive elements such as uranium and thorium and the important carcinogenic factor of causing the lung cancer.
氡及其子体是铀、钍等放射性元素产物，是引发肺癌的重要致病因子。
2
What are the elements of your role as a daughter, a girlfriend, a career woman, a wife, a mother, that bring you joy?