adj.未精炼的；粗俗的
Diesel fuel is low-grade and comparatively unrefined. 柴油引擎的燃料是等级且未精炼的。
Refined girls are often drawn to unrefined men. 淑女常对莽汉倾心。
Leave dynamite to the low and unrefined. 把炸药留给那些低劣的人吧。
