301. in fashion(=stylish， most modern)时兴，流行
302. after the fashion (of) 依照…
303. find fault with(=complain about; criticize)找毛病，对…吹毛求疵
304. at fault (=in the wrong， blamable)有错
305. in favour of 赞成
306. be in favour with 受宠， 受偏爱;
out of favour with 失宠， 不受宠
307. in one‘s favour(=to one’s advantage)对。有利
308. (be) favourable to(=advantageous)有利的
309. fear for (=be afraid for the safety of sb. or sth.) 为…担心
310. for fear of (=in case of; because of anxiety about) 以防， 由于怕
311. in fear of (=afraid for the safety of) 担心
312. feed (sb.) on sth. 靠吃…， 用…喂养
313. be fed up with(=be unhappy， tired about sth. dull) 厌烦， 腻了
314. feel like (=have a desire for) 想要
315. fill in 填写
316. fill out ( =fill in )填写
317. set the world on fire=set the flames on fire(=do sth. remarkable)有突出成就
318. play with fire (=take great risks)干冒险事
319. set sth. on fire(=set fire to sth.)使……着火，放火
320. at first sight(=when first seen)乍一看，一见
321. for the first time 第一次 (作状语)
322. in the first place 首先， 第一
323. fit into 刚好放入
324. fit in with ( = suit ， fall into agreement) 合适， 相配， 一致
325. (be) fit for (=right and suitable for) 适合
326. focus on (=concentrate on) 集中在…上 focus sth. on 把…集中在…上
327. be fond of 喜欢
328. (be) in force 有效 ， 实施
329. go into force 开始生效
330. by force 靠武力， 强行
331. force…on 把…强加给…
332. in the form of 以…形式
333. be fortunate in 幸运，有好运气
334. free of charge 免费
335. be freed from 免受， 没有…
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