可用: available; usable度: surmise; estimate不可用度: unavailability高可用度: high availablity规定可用度: desired availability极限可用度: limiting availability; limiting control渐近可用度: asymptotic availability可用度管理: availablity management可用度上限: availability upper ci可用度下限: availability lower ci平均可用度: average availability; mean availability时间可用度: time availability瞬时可用度: instantaneous availability稳态可用度: steady-state availability获得的可用度: achieved availability渐近不可用度: asymptotic unavailability平均不可用度: average unavailability; mean unavailability瞬时不可用度: instantaneous unavailability稳态不可用度: steady-state unavailability规范化的不可用度: normalized unavailability渐近平均不可用度: asymptotic mean unavailability渐近平均可用度: asymptotic mean availability不可用度与时间关系: unavailability over time基于任务剖面可用度: mission availability用度: expenditure; expense; outlay 他家人口多, 用度大。 he has a big family and many expenses