flywheeln.
英 'flaɪwiːl | 美 'flaɪ'wil
中文n. [机] 飞轮，惯性轮；调速轮
词根词源
flywheel (n.)also fly-wheel, "heavy-rimmed revolving wheel to regulate motion," 1784, from fly (n.) "speed-regulating device" (1590s, from fly (v.1)) + wheel (n.).
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