“通达系”的概念、定义、翻译、参考文献-科学参考

单词	通达系
释义	通达系 Encyclopedia 工学〔邮政快递运营商〕释 Tong Da Express通达系申通快递、圆通快递、中通快递和韵达快递四家快递企业的统称。又称“三通一达”快递。
随便看	upper side frequency Upper Silesia Coalfield upper singular exponent upper solution upper solution; supersolution upper-stage upper stage liquid rocket engine upper strong derivative upper subsemilattice upper sum upper surface upper tangent arc upper topological limit upper transit upper triangular group upper triangular matrix upper-trimmed subsequence upper type upper unitriangular matrix upper urinary tract infection upper urinary tract lithiasis upper value upper variation Upper Volta upper water level for flood control

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。