The radon and its daughter elements 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。
What are the elements of your role as a daughter, a girlfriend, a career woman, a wife, a mother, that bring you joy?
在你扮演女儿、女友、职业女性、妻子、母亲的这些角色中，哪些因素能给你带来欢乐？
What are the elements of your role as a daughter, a girlfriend, a career woman, a wife, a mother, that bring you joy?
在你扮演女儿、女友、职业女性、妻子、母亲的这些角色中，哪些因素能给你带来欢乐？
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