Radioactivity is the ejection of particles or radiation from the nucleus. 放射性是原子从核中射出粒子或辐射的现象。
The aftermath of the Chernobyl nuclear accident, for example, might reasonably be expected to have revealed the effects of radiation on health. 比如说,切尔诺贝利的核事故可能或多或少揭示了辐射对健康的影响。