这些物质被称作“放射性同位素”—同一种元素的变种，他们具有异常的中子数量，频繁的衰变和放出辐射。
These materials are known as "radioisotopes" -versions of an element that, because they have an abnormal number of neutrons, frequently decay and release radiation.
同位素是一个特定化学元素的不同原子变种。
Isotopes are different atomic versions of a particular chemical element.
同位素是一个特定化学元素的不同原子变种。
Isotopes are different atomic versions of a particular chemical element.
应用推荐