And on the same day, a 17m space rock exploded over Russia's Ural mountains with an energy of about 440 kilotonnes of TNT.
BBC: Dinosaur-killing space rock 'was a comet'
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。