radiation/ˌreɪdɪ'eɪ∫ən/

n. powerful and very dangerous energy that radioactive substances send out

n. [U] 放射线，辐射能：This kind of stone produces high levels of radiation. 这种石头产生很强的辐射。

构词radiate（辐射） + -ion

音组-iation/-ɪ'eɪ∫ən/

appreciation; pronunciation; radiation