ubacWiktionary 原文演变路径（由近及远）英语借自 ←奥克语 ubac源自 ←拉丁语 opācus词源说明Borrowed from Occitan ubac, from Latin opācus. Doublet of opaque.释义（英文）名词 Noun(geography) The shady side of a mountain; in the northern hemisphere, this is typically the north-facing slope.词族同源异形词（1）opaque