“Penny Black Stamp”的概念、定义、翻译、参考文献-科学参考

单词	Penny Black Stamp
释义	Penny Black Stamp Encyclopedia 工学邮资凭证释 Penny Black Stamp黑便士 1840年英国发行的世界上第一枚邮票。5月1日发售，5月6日正式使用。面值为1便士，用黑色油墨印制。
随便看	Spring Mountain with Green Trees by Dai Jin spring oscillator Spring Outing of the Happy Couple Spring Outing Screen Spring Peaks in a Morning Mist spring peanut spring persistent rains spring pine gate hydraulic brake spring rapeseed Spring Riding in a Carriage spring-ring friction joint spring rise Springs spring safety valve spring scraper Spring Silkworm Spring Society spring sown crop Spring's Seedling Spring Sun Society spring's wear spring table Spring Thunder Society spring tide Springtime Can't be Locked up

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。