Ø fear for (=be afraid for the safety of sb or sth) 为…担心
　　 If you fear for someone or something, you are very worried because you think that they might be in danger.
　　 Ø for fear of (=in case of; because of anxiety about) 以防, 由于怕
　　 "The teacher refused to have his daughter in his class, for fear of showing favour to her."
　　 "教师不愿意把自己的女儿编入自己的班级,恐怕会对她有所偏袒。"
　　 Ø feed (sb) on sth 靠吃…, 用…喂养
　　 Slugs feed on decaying plant and animal material.
　　 Ø be fed up with(=be unhappy, tired about sth dull) 厌烦, 腻了
　　 If you are fed up, you are unhappy, bored, or tired of something, especially something that you have been experiencing for a long time. (INFORMAL)
　　 Ø feel like (=have a desire for) 想要, 如同
　　 If you feel like a particular type of person or thing, you are aware of having some of the qualities or feelings of that person or thing.
　　 He felt like a dwarf.
　　 Ø fill out ( =fill in )填写
　　 Please carefully fill out the job application.
　　 仔细填写工作申请
　　 Ø set the world on fire=set the flames on fire(=do sth remarkable)有突出成就,非常成功
　　 People do not count him as a hero for he has not set the world on fire. 人们并不把他看作民族英雄，因为他并未做出惊天动地的事情
　　 Ø play with… 玩火…
　　 The children were playing with a ball.
　　 孩子们在玩球。
　　 Ø set sth on fire(=set fire to sth)使着火,放火
　　 Can Steam Pipes Set Wood On Fire? William J. Baldwin answers the question once.
　　 Ø at first sight(=when first seen)乍一看,一见
　　 Ø for the first time 第一次 (作状语)
　　 Ø in the first place 首先, 第一
　　 Ø fit into 刚好放入 适合 适应
　　 She does not fit into the rigid social system.
　　 Ø fit in with ( = suit , fall into agreement) 合适, 相配, 一致
　　 I spent my whole adolescence yearning to be ``normal’’ and trying to fit in with everybody else.
　　 Ø (be) fit for (=right and suitable for) 适合
　　 This food is not fit for your visitors.
　　 这食物对你的客人来说不合适。
　　 Ø focus on (=concentrate on) 集中在…上 focus sth on 把…集中在…上
　　 If you focus on a particular topic or if your attention is focused on it, you concentrate on it and think about it, discuss it, or deal with it, rather than dealing with other topics.
　　 The research effort has focused on tracing the effects of growing levels of five compounds.
　　 Ø be fond of 喜欢
　　 I am not fond of eating meat. 我不喜欢吃肉。
　　 Ø (be) in force 有效 , 实施
　　 A rule that is no longer in force. 不再有效的规则
　　 Ø by force 靠武力, 强行
　　 If someone uses force to do something, or if it is done by force, strong and violent physical action is taken in order to achieve it.
　　 Ø force…on 把…强加给… impose…on…
　　 New duties were forced on wines and spirits.
　　 酒类被加征新税。