sufficient 充足的 sufficient manufacture 制造 manufacture difficulty困难的 difficulty difficult困难的 difficult facility 灵巧facility

facilitate 使容易 facilitate faculty 才能 faculty figure 数字 figure feasible 可行的 feasible possible 可能的 possible possibility

可能的 possibility possibly 可能的 possibly make 制作 make function 功能 function feature 特征 feature bear 熊 bear

fertilizer 肥料 fertilizer birthday 生日 birthday born 出生的 born conference 会议 conference different 差异的 different

difference 差异 difference indifferent 冷漠的 indifferent infer 推论 infer inference推论 inference interfere 干涉 interfere

interference 干涉 interference offer 提供的 offer