“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	carpus car pusher CARR Carracci brothers carrageen carrageenan Carreau–Yasuda model carriable type of corn harvester Carriacou Island carriage carriage-driving techniques carriage-maker carriage of goods by waterway carriage of passengers by sea carriage return Carrier carrier carrier-actuated carrier aircraft auto throttle control carrier aircraft landing gear test carrier and missile interference carrier-based aircraft arresting hook test carrier-based aircraft catapult launch test in field carrier-based aircraft electromagnetic compatibility test for electromagnetic launch carrier-based aircraft engaging cross deck pendant test in field

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。