Freu弗勒FRabbr.故障率（=failure rate）abbr.故障记录（=faillure record）abbr.故障报告（=failure report）frustrating time令人感到挫折的时刻fructus galangae[医] 红豆蔻Fresnel equation菲涅耳方程freon compressor氟立昂压缩机fructus cannabis火麻仁fructus catalpae梓实frecision timing精确计时fructus ailanthi臭椿籽Frenzel's methodFreiberg disease佛莱贝格病