A term a is said to narrow to a term b using a substitution s (which replaces a variable v by expression e) provided a is obtained from b by replacing an instance of e in b by v.
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。