irradiationn.
英 ɪ,reɪdɪ'eɪʃ(ə)n | 美 ɪ,redɪ'eʃən
中文n. 照射；发光，放射
词根词源
irradiation (n.)1580s, from French irradiation, from Latin *irradiationem, noun of action from past participle stem of irradiare (see irradiate). Originally of light (literally and figuratively); of X-rays, etc., from 1901.
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