Nirgal Vallis is a long river channel bordering the Coprates quadrangle, Phoenicis Lacus quadrangle and Margaritifer Sinus quadrangle of Mars at 28.4° south latitude and 42° west longitude.
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。