emissionn.
英 ɪ'mɪʃ(ə)n | 美 ɪ'mɪʃən
中文n. （光、热等的）发射，散发；喷射；发行\nn. (Emission)人名；(英)埃米申
（光、热等的）发射，散发；喷射；发行
n. (Emission)人名；(英)埃米申
词根词源
emission (n.)early 15c., "something sent forth," from Middle French émission (14c.) and directly from Latin emissionem (nominative emissio) "a sending out, a projecting, hurling, letting go, releasing," noun of action from past participle stem of emittere "send out" (see emit). Meaning "a giving off or emitting" is from 1610s.
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