“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	spontaneous combustion spontaneous combustion in gob area spontaneous combustion of coal spontaneous combustion of coal layer spontaneous combustion of sulfide ores spontaneous curvature spontaneous decay spontaneous depolarization spontaneous desorption mass spectrometry spontaneous desorption mass spectrometry (SDMS) spontaneous disintegration spontaneous emission spontaneous emission coefficient spontaneous emission steering spontaneous emission trapping spontaneous fire spontaneous fission spontaneous fission neutron source spontaneous fission track spontaneous force trap spontaneous fusion spontaneous generation spontaneous ignition spontaneous ignition temperature spontaneous interoperation

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。