“U级”概念、定义、翻译-科学时代

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。

单词	U级
释义	美术、书法与摄影词汇手册 U级 U-certificate
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