“PIE（Proto-Indo-European）”概念、定义、翻译-科学时代

单词	PIE（Proto-Indo-European）
释义	请查阅PIE--PIE（Proto-Indo-European）
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科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。