A statement or proposition is contingent if it is neither always true nor always false. For example ‘x is divisible by 2’ is true when x = 2, 4, 6,…but is not true when x=3,4.3,7.
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。