Logic first explored by the Oxford philosopher Arthur Prior, obtained by adding two propositional operators ‘P’ (in the past…) and ‘F’ (in the future…) to classical propositional and first-order logic.
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。