undo [] vt.解开,打开;取消;毁灭,破坏
facility [] n.灵巧,熟练,能力; (pl.)设备,设施,便利条件
facilitate [] v.使变得(更)容易;使便利;推动;帮助;处进
faculty [] n.才能,能力;系,科
difficult [] a.困难的;难对付的;难以满足的
difficulty [] n.困难;难事;困境
fact [] n.事实;实际,实情
faction [] n.派别,宗派,小集
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