“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	landfill odor nuisance landfill of waste mud landfill operations landfill reclamation landfill shunt of rainwater and sewage landfill site selection landfill slide landfill vertical barrier land finance land financing landform assemblage landform forming process landform reshaping landforms and landscape devastation Land for mulberry cultivation land for rural residential building land for tertiary uses land founctions land function classification land geophysical exploration land grading land grant college land hierarchy land information database land information management

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。