A graphical input device that returns the position of a puck or stylus as it is moved over a flat surface. The term was originally a tradename used by Sylvania to describe a product of this type.
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。