“PTA (preferential trade area)”概念、定义、翻译-科学时代

单词	PTA (preferential trade area)
释义	请查阅PTA--PTA (preferential trade area)
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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。