“未用余额”概念、定义、翻译-科学时代

单词	未用余额
释义	旅游词汇手册未用余额 unexpended balance; unused balance
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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。