双: two; twin; both; dual主: host用: 40分钟跑完全程 run the course in 4 ...系统: system主用配电系统: primary distribution system主用: w workingg实用系统, 应用系统: utility system包用系统: turnkey system备用系统: back up system; redundant system; standby system备用系统库: back-up system library多共用系统: multishare system公用系统: common service system; synergic system; system utility; utility system商用系统: bs business system实用系统: live system; utility system水再用系统: water reuse system通用系统: general purpose system; general-purpose system; utility system未用系统: virgin system应用系统: a lication system; application system应用系统级: application system level争用系统: contention system中断用系统: interrupt-oriented system专用系统: custom-built system; dedicated system; proprietary system自用系统: in-house system报话两用系统: composite system波分复用系统: wdm systems
