We just read in the front pages of America's papers that there are over 100, 000 hours of tapes unlistened-to.
NPR: Transcript of Presidential Debate
unlistened:
un- +? listened
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。