lead balloon
There is no such thing. There was, however, a great rock band in the 1960s and 1970s
known as Led Zeppelin, but it’s not the same thing. See also paperless office.
科学参考收录了5291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。