decelerationn.
英 'diː,selə'reɪʃən | 美 di,sɛlə'reʃən
中文n. 减速
词根词源
deceleration (n.)1894, originally in railroading, coined from de- "do the opposite of" (see de-) + (ac)celeration.
Verily "deceleration" is a word which could only be coined by the Great Western. ["Engineering," Feb. 2, 1894]
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