Refki雷夫基refn.裁判员Refluent ethanol extraction乙醇回流法refractive index difference折光指数差别Reforesting cultivated land退耕还林refrigerated centrifugation冷冻离心法refractive error/surgery屈光不正／外科手术refract-reflect telescope折反望远镜refrigeration to keep fresh产地冷藏保鲜refrigeration air condition制冷空调refining equipments in sets[化] 炼油成套设备Refining-machine operator炼油机操作工(油和脂肪)