Rays leaving a source and landing on something. Picture a lamp in a dark room: the light goes out from one point, travels, and settles on whatever is in front of it, and that thing is changed — it is now bright all over. Every use of irradiate keeps that shape. Only three things vary: what the rays are made of, which end of the journey you are watching, and whether the target is a wall, a face, a , a bag of , or a person's mind.
From the word’s history
Wiktionary traces the word to Medieval Latin irradiatus, from ir- (on, upon) plus radiare, from radius, a ray of light or the spoke of a wheel. The spoke is worth keeping in mind: lines going out from one centre. It also notes that the adjective is older in English than the verb.
來源資料把這個字追到中世紀拉丁文 irradiātus：ir-（朝上、打在上面）加上 radiō，而 radiō 來自 radius——一道光線，也是車輪的輻條。輻條這個意思值得記住：一堆線從同一個中心往外射。這正是這個字今天所有用法的骨架。資料也提到，英文裡形容詞 irradiate 出現得比動詞還早。
Wiktionary entries for irradiate (adj. and verb); packet etymology_text, source_refs kaikki:3f6f69a190036ae4:1247275880:5909 and kaikki:3f6f69a190036ae4:1247281789:30544
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