five fu五府fivenum.五five hundred and forty two(=542) 五百四十二five-school-day system周五日制Five-level atomic system五能级原子系统Five input and tape output五组输入及录音输出Five is less than seven.五比七小。five hundred and forty six(=546) 五百四十六Five axis machining center五坐标机床five-pattern personality五态性格five-address instruction五地址指令five cases of sudden death五绝