“National Negro Convention”的概念、定义、翻译、参考文献-科学参考

单词	National Negro Convention
释义	National Negro Convention Encyclopedia 历史学美国历史释 National Negro Convention美国全国黑人大会美国内战前北部自由黑人召开的年度黑人全国大会。
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科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。