“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	rail gun rail haulage drift rail launcher rail milling and grinding car rail mobile launch rail pressure control Railroad Guerillas Railroad Revitalization and Regulatory Reform Act (U.S.) railroad track problem rail/sleeper laying and replacing machinery rail transit rail transit engineering survey rail transit safety rail transit station public area rail transit vehicles rail transport vehicle rail-type missile launcher railway accident injury railway alignment railway automatic fare collection system railway auto-transformer power supply railway big data platform railway box car railway bridge railway bridge deck facilities

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。