[计] UNIX操作系统 (unix operating system 的复数) unix operating system: unix操作系统operating systems: 漫谈操作系统alternating operating systems: 替供选用的操作系统diskette operating systems: 软磁盘操作系统distributed operating systems: 分布式操作系统下载手机词典可随时随地查词查翻译