“首日封”的概念、定义、翻译、参考文献-科学参考

单词	首日封
释义	首日封 Encyclopedia 工学集邮品释 first day cover首日封在新邮票发行首日，将该套邮票的全套或单枚贴在特制信封、普通信封或纪念信封的右上角，加盖当日邮政日戳或特制的首日纪念邮戳的信封。
随便看	free central placenta free charge free-charge normal student Free China free-choice net free choice of administrative reconsideration free choice of the will Free Cinema free climbing free code Free Comment free commutative ring free competition free composition free concentration wave Free Contention Among Different Schools of Thought and Different Forms of Art Free core nutation free core nutation Free Cranes Pavilion in Hangzhou Free Cranes Pavilion in Xuzhou free-cutting copper alloy free damping layer free d Dyck path free d-Dyck path free decomposition

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。