“opt-in e-mail advertising”概念、定义、翻译-科学时代

单词	opt-in e-mail advertising
释义	广告学词汇手册 opt-in e-mail advertising 自愿订阅式电子邮件广告
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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。