外插失效率 failure rate: mtbf; 故障率失效率; 平均故障率; 破損率; 事故率rate of failure: 失敗率extrapolated: 推算的; 外推的acceptable failure rate: 合格故障率; 容許故障率afr acceptable failure rate: 容許故障率下載手機詞典可隨時隨地查詞查翻譯