“郑和下西洋”的概念、定义、翻译、参考文献-科学参考

单词	郑和下西洋
释义	郑和下西洋 Encyclopedia 历史学中外关系释 Zheng He's Voyages to Western Seas郑和下西洋 1405～1433年，郑和率领船队7次出使亚非30多个国家和地区，是中国航海史和外交史上的重大事件。
随便看	unitary sampling unitary scattering factor unitary semigroup unitary semisimilarity unitary semi-similitude unitary similarity unitary similar matrix unitary sociable number unitary space unitary spin unitary subalgebra unitary subring unitary symmetry unitary symplectic group unitary transformation unitary transformation group unitary trick unitary unimodular group unitary vector space unit ausiliary transformer unit automatic start-up and shut-down control unit ball unit basis unit bore system unit boundary

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。