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Children were not permitted to roam around the second and first floors of the White House.
孩子们不允许在白宫的二楼和一楼到处闲逛.
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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。