abbr. 计算机辅助设计(Computer - Aided Design)
cad 无赖
由cadet衍申出来的贬义用法。
A cad used to be a jumped-up member of the lower classes who was guilty of behaving as if he didn't know that his lowly origin made him unfit for having sexual relationships with well-bred women. [Anthony West, "H.G. Wells: Aspects of a Life," 1984]