The effective compound code (comprising an inner code followed by an outer code) employed in a concatenated coding system, or a code designed for use in such a system, either as the inner code or as the outer code.
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。