See multiplication (of numbers).
A category used traditionally in the classification of plants that consists of one or several similar classes. An example is the Spermatophyta (seed-bearing plants). In modern classification systems the phylum has replaced the division.
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。