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.
自不稳定核之间存在着锕系元素，包括钍和稳定核像灌了铅，铋，爆炸性事件，如超需出示锕。
Since the unstable nuclei exist between actinides, including thorium and stable nuclei like lead and bismuth, explosive events such as supernovae are required to produce actinides.
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.
当一个中子轰击一个原子核的时候，这个核可能会俘获这个中子，从而变的极不稳定。
When a neutron hits an atomic nucleus, the nucleus can absorb the neutron and become unstable.
目的探讨增殖细胞核抗原(pcna)的表达和细胞凋亡在人冠状动脉不稳定斑块中的作用。
ObjectiveTo investigate the roles of apoptosis and express ion of PCNA in human vulnerable atherosclerotic plaque.
本文中我们利用盘不稳定模型和星爆模型的基本思想，模拟活动星系核在光学波段的光度和光谱斜率变化，并将模拟的结果和观测进行比较。
In this paper, using disk-instability model and starburst model, the AGN optical variability and spectral slope variability are simulated and confronted with observations.
在自然界，凡原子核不稳定，过一些时间自发地变成其它元素原子核的元素，称为放射性元素。
In nature, the element, whose nucleus is unstable and will grows to be nuclear of other element, is called radioactive element.
在自然界，凡原子核不稳定，过一些时间自发地变成其它元素原子核的元素，称为放射性元素。
In nature, the element, whose nucleus is unstable and will grows to be nuclear of other element, is called radioactive element.
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