half-bright nut半: half精制: make with extra care; refine ...螺母: nut source; origin; parent半精制螺帽: half-bright nut半精制螺栓: half-bright bolt下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:半精制螺母，即可在微信中查询翻译
