“Alaska Purchase”的概念、定义、翻译、参考文献-科学参考

单词	Alaska Purchase
释义	Alaska Purchase Encyclopedia 历史学美国历史释 Alaska Purchase阿拉斯加购买 1867年美国从俄国手中购买俄属阿拉斯加的兼并行动。
随便看	background galaxy background galaxy cluster background glow backgrounding background intensity background investigation background limited detectivity background mass spectrum background mathematics background mode background monitoring background music background noise background-noise level background optical and electromagnetic characteristic background projection process background radiation background radiation intensity background radio radiation background rejection background source background source function background star background subtraction Background survey

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。