“投下”的概念、定义、翻译、参考文献-科学参考

单词	投下
释义	投下 Encyclopedia 历史学[政治制度]释 appanage投下又作头下、头项或投项，意为封地、采邑，语出辽代。
随便看	printed towel printed two dimension material ink printed wiring board print electric machine printer printer engine printer's errors print head printing printing advertisement printing and dyeing machine printing chronograph printing colour reproduction printing cylinder printing decorated cloth printing digital workflow printing document examination printing down printing equipment printing factories of Central Soviet Area printing handkerchief printing ink Printing Institute of the Buddhist Scriptures printing materials printing-out paper

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。