n.<化>氡(元素符号Rn)
Radon is known to be harmful to humans in large quantities.
众所周知,大量的氡会对人体造成伤害。
Radon is the daughter of radium.
氡是镭的子体.
There is an acknowledged risk of lung cancer from radon.
氡被认为有诱发肺癌的危险。