In traditional logic and grammar, the division between universal propositions (all A’s are B; no A’s are B) and particular propositions (some A’s are B, some A’s are not B).
科学参考收录了60776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。