Obolensk () was a city in Russia, and in the medieval period one of the Upper Oka Principalities, situated at the Protva River (some 80 km south-to-southwest of Moscow, or some 20 km downstream (east) of Obninsk).
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。