FRN=Fatigue Resistant Nylon Cord 耐疲劳尼龙帘线FRabbr.故障率（=failure rate）abbr.故障记录（=faillure record）abbr.故障报告（=failure report）Fructu Lycii枸杞Fresnel zone菲涅耳带,菲涅耳区,菲涅耳区间隙frunace door[机] 炉门Fructus Comi山茱萸Fruetus Mume乌梅fructivorousadj.吃果实为生的fresnel spot菲涅耳光斑frustulation螅芽压缩frustum body平截头体frunace flue[机] 烟道