1 powerful and very dangerous rays that are sent out from certain substances. You cannot see or feel radiation but it can cause serious illness or death 辐射
☞Look at radioactive. 参看radioactive。
2 heat, light or energy that is sent out from sth 放热;发光;辐射能:
ultraviolet radiation紫外线辐射
radiation/͵redIˋeʃən; ˌreIdiˈeIʃ$n/n [U] 1 a form of energy that comes especially from NUCLEAR reactions, which in large amounts can harm or kill people 辐射﹔〔尤指〕核辐射: radiation sickness 放射病2 energy in the form of heat or light that is sent out as waves that you cannot see 辐射的热能[光能]: ultraviolet radiation from the sun 太阳发出的紫外线辐射
radiationradiationradiationsnoun (no plural)dangerous energy that some substances send out: High levels of radiation have been recorded near the nuclear power station.