f duction f 转导f factor 性因子f pilus f 菌毛f strain f 菌株f+ strain f+菌株f2 generation 第一代杂种f3generation 第二代杂种face 颜facet 小眼面faceted eye 复眼facial angle 颜角facial cystidium 侧生囊状体facial expression 用手势模仿facial form 脸型facial gland 颜腺facial nerve 面神经faciation 变群丛facies 演替系列变群丛facies fossil 指相化石facies index 指相化石facilitation 促进factor 因子factor map 遗传图factor of determination 决定因子factor of realization 实现因子factor pair 基因成对factorial analysis 因子分析facultative aerobe 兼性需氧菌facultative anaerobe 兼性厌氧菌facultative parasite 兼性寄生物facultative saprophyte 兼性腐生菌facultative saprophytism 兼性腐生facultative shade plant 兼性阴地植物fad 黄素腺嘌呤二核苷酸faecal 粪的faecal stone 粪化石faeces 粪fagopyrism 荞麦中毒failyear 凶年fairy ring 仙环falcate 镰刀状的falciform 镰刀状的falciform process 镰状突fall planting 秋植fallopian tube 输卵管fallow 休闲地fallow field 休闲地false annual rin