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Those spending 10-19 hours per week on their devices were 41 percent more likely to be unhappy than lower-frequency users.
2019年12月六级真题（第一套）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。