“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	half maximal inhibitory concentration half-maximum line breadth half-metal half-metallic ferromagnet half-metallic magnetic materials half-metal materials half-model test half-module half moon half-Moses circle half-neighborhood half-normal distribution Half of a Yellow Sun half-open interval Hal Foster half page advertisement half-parameter half peak width half-peak width half-period half-periodic solution half-period ratio half-period zone half plane half-plane

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。