“Petra”的概念、定义、翻译、参考文献-科学参考

单词	Petra
释义	Petra Encyclopedia 理学约旦释 Petra佩特拉约旦古城。历史学亚洲文物释 Petra佩特拉古城约旦著名古城遗迹。为公元前4～公元2世纪纳巴泰王国（Nabataean）首都。
随便看	flat sheaf flat smooth function flat sour spoilage flat space flat space theorem flat spacetime flat spectrum flat spectrum radio quasar flat spectrum source flat spiral feed flat spiral spring flat spring flat-stab buttress bam flatstem milkvetch seed flat storehouse flat structure flat submanifold flat surface flat surface screen printing flattener flattening flattening factor flattening of ellipsoid flattening of fold flatter surface

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。