“方孔圆钱”的概念、定义、翻译、参考文献-科学参考

单词	方孔圆钱
释义	方孔圆钱 Encyclopedia 历史学中国古代钱币释 Circular Coin with a Square Hole方孔圆钱中国战国时期齐、燕、秦三国的通行货币中有方孔的圆钱。
随便看	closed circuit hydraulic system closed circular DNA closed circulating water system closed class closed combinatorial surface closed communication structure closed complex closed complex plane closed composition closed cone closed contour closed convex function closed convex functional closed convex hull closed convex hypersurface closed convex set closed convex surface closed covering closed current closed curve closed-curve problem closed cycle closed cycle engine closed-cycle refrigerator closed differential

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。