adj.未精煉的；粗俗的
Diesel fuel is low-grade and comparatively unrefined. 柴油引擎的燃料是等級(jí)且未精煉的。
Refined girls are often drawn to unrefined men. 淑女常對(duì)莽漢傾心。
Leave dynamite to the low and unrefined. 把炸藥留給那些低劣的人吧。
