When a router is unable to find the destination of an email message it adds a large amount of technical information to the email which enables an expert to diagnose the problem. This information is known as router droppings.
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。