“世界旅游日”的概念、定义、翻译、参考文献-科学参考

单词	世界旅游日
释义	世界旅游日 Encyclopedia 管理学旅游组织释 World Tourism Day世界旅游日由联合国世界旅游组织（UNWTO）确定的旅游工作者和旅游者的节日。定于每年9月27日。
随便看	closed loop guidance closed loop orbit closed-loop pressurization closed loop servo system closed loop supply chain closed-loop supply chain closed loop system closed loop test closed-loop test of flight control system closed-loop vector method closed magnet unit closed manifold closed mapping closed mixed-refrigerant cycle liquefaction process closed model Closed Mondays closed monoidal category closed morphism closed motor skill closed n-ball closed n-disk closed neighborhood closed neighbourhood closedness closedness of dictionary

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。