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The character 辊 (traditional 輥) is a phono-semantic compound. The left-side radical, 车 (車 in traditional), is the vehicle or cart radical, which indicates a semantic link to wheels, rotation, or mechanical parts. The right-side component, 昆, is phonetic. Originally, the character referred to the continuous, rotational spinning of wheels or the rapid whirling of cart components. With advances in mechanical engineering, the character's application shifted: rather than describing a spinning action, it came to name a cylindrical mechanical part, a roller, cylinder, or rolling pin, that flattens, presses, or moves materials in machinery.
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