“瓮城”的概念、定义、翻译、参考文献-科学参考

单词	瓮城
释义	瓮城 Encyclopedia 工学中国古代建筑类型释 urn city瓮城围筑于城门外（或内）侧的小城圈。其上开有瓮城门，形状多为方形或圆形。工学〔宋-清﹞释 None瓮城城墙在城门口处加筑的小城。又称甕城。
随便看	closeable operator close arc close binary close binary galaxy close binary star close binary system close collision close configuration close-confinement close coupling approximation close-coupling approximation close coupling calculation close-coupling calculation close cultivation of grassland close curve closed closed-and-open set closed-and-open subset closed and unbounded set closed and unbounded set; club set closed arc closed architecture closed ball closed base closed basin

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。