Any substance or matter (element, compound, or mixture) in any physical state (gas, liquid, or solid). In a process, material may undergo change in its form but the total mass remains constant. Material and mass are therefore not synonymous.
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。