a person oblivious to social changes
a person who sleeps a lot
the title character in a story by Washington Irving about a man who sleeps for 20 years and doesn't recognize the world when he wakens
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。