“empty set”的概念、定义、翻译、参考文献-科学参考

单词	empty set
释义	empty set [`em·tē `set] ^MATHEMATICS The set with no elements.
随便看	fold belt folded cavity folded dipole folded-dipole antenna folded horn folded-plate roof folding folding boards folding door folding fin foldover fold system Foldy effect folia foliaceous foliage foliar foliated ice foliate papilla foliation folic acid folic acid sodium salt folie à deux foliferous foliicolous

科学参考收录了103327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。