A simple form of animation which was very popular on the Web in its early days and is still seen. It consists of drawing a number of GIF graphics which differ slightly from each other and displaying them sequentially.
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。