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40s
Although frozen dinners were invented in the 40s, their popularity didn't boom until televisions became popular a decade or so later.
2015年12月四级真题（第三套）阅读 Section B
英汉双解词典包含4367426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。