fail to 不能，记忆
without fail 必定，务必
in faith 确实，的确
keep faith 守信，忠于信仰
break faith 背信，背弃信仰
fall back on 求助于，转而依靠
fall behind 落在…后面，跟不上
fall for 爱上，迷恋;受骗
fall in love 爱上某人
fall in with 偶尔遇到;同意，赞许
fall into 落入;陷于;河流注入
fall out 争吵;闹翻;结果
fall out of 放弃(习惯等)
fall through 失败，成为泡影
fall to 着手;开始攻击
fall under 受到(影响等);被列为
a far cry 遥远的距离
as far as …那么远，直到;至于
far and away 大大…;无疑地
far and near 远近，到处，四面八方
far from 远离，决不，完全不
in so far as (程度等)就…;至于
