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So, for example, my sister's birthday is December 9th and her golden birthday would have been the year she turned nine years old.
2017年12月四级真题（第二套）听力 Section B
The Vikings' first major discovery occurred in the 9th century.
2017年12月四级真题（第一套）听力 Section C
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。