A tax on transactions, levied by requiring that documents bear an official stamp to be legally valid. In the UK at one time there was a small stamp duty on cheques; it is now levied on some sales of property and on share transfers.
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。