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speed controller /ˈspiːd kəntɹˈəʊl/ n

中文：转速调节器

中文 · 转速调节器Español · pedal de velocidadFrançais · contrôle de la vitesse
Meaning：Pedal that regulates the speed of the machine’s electric motor; the greater the pressure on it, the greater the speed.
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Sewing machine foot controller

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