.fit in with (=suit, fall into agreement)合适，相配，一致
.(be) fit for (=right and suitable for)适合
.focus on (=concentrate on)集中在……上
focus sth. on把……集中在……上
.be fond of喜欢
.(be) in force有效，实施
.go into force开始生效
.by force靠武力，强行
.force...on把……强加给……
.in the form of以……形式
.be fortunate in幸运，有好运气
.free of charge免费
.be freed from免受，没有……
.in front of在……前面
in the front of在……前部
