| 1. | Further energy is given off in their decays .
在它们蜕变时又放出一些能量。 |
| 2. | This is because the oxidation breaks down magnetite .
这是因为氧化磁铁矿蜕变。 |
| 3. | When the uranium disintegrates, it changes into lead .
当铀蜕变时，它变成了铅。 |
| 4. | There is little we can do to stop this natural disintegration of the continents .
我们难以阻止这种陆地的自然蜕变作用。 |
| 5. | The energy results from a loss in mass of the nuclide during its transformation .
这种能量来源于核素在蜕变时质量的损失。 |
| 6. | The radioactive wastes release a lot of energy due to radioactive disintegration .
由于放射性蜕变，放射性废料释放出大量的能量。 |
| 7. | The radioactivity of a sample is defined to be the number of disintegrations per unit time .
样品的放射性定义为每单位时间的蜕变数目。 |
| 8. | Alpha particles are positively charged helium nuclei obtained from natural radioactive decay .
粒子是从天然放射性蜕变得到的带正电的氦核。 |
| 9. | The "normal" thing is for a particle to undergo decay and transmute itself into other lighter particles .
粒子发生衰变，本身蜕变为其它较轻的粒子，这是“正常”的事。 |
