核裂变只能在某种类型的重核及不稳定核素内发生，如铀- 235及钚- 239。
Nuclear fission can only occur in some types of heavy and unstable nuclei such as in the uranium -235 and plutonium -239.
这种原子通过释放射线从不稳定状态变到更加稳定的状态的过程被称为核衰减或放射。
The process by which an atom changes from an unstable state to a morestable state by emittingradiation is called radioactive decay or radioactivity.
不出所料，在核问题上立场最不稳定的欧洲国家一直是德国，该国强大的工程技术与反核情绪在不安状态中长期共存。
The most labile European country on matters nuclear has, not surprisingly, been Germany, where great engineering and anti-nuclear sentiment have long coexisted uneasily.
应用推荐