炼油

炼油	liàn yóu	to refine crude oil / to render animal fat
炼	liàn	to refine / to smelt
炼	liàn	variant of 链, chain / variant of 炼
油	yóu	oil / fat / grease / petroleum / to apply tung oil, paint or varnish / oily / greasy / glib / cunning