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The fifteenth item in a series is the one that you count as number fifteen.
the invention of the printing press in the fifteenth century.
15世纪印刷机的发明。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。