sumi<日> n.(书法和绘画用的)烟灰墨(块)sumn.金额；总数；要点v.概括；总结；归纳；总计summarization and simplicity概括与简化sum efficiency extrapolation相加效率外推sum-and-difference system和差系统summaries and recommendations总结和建议Sum withdrawn from an account从帐户中提取的款项sum of squares between groups组间平方和summarization of disquisitions研究综述sum-of-the-year-digits(美国租赁业一种折旧法) 数字总和法sum-and-difference network和差网络sum of fundamental frequencies合频