您要找的是不是：
n. 焦点；焦距；聚焦（focus的复数）
n. （古爱尔兰）诗人
The I.M.F.predicts developing economies will continue to grow for the year, but only by about one and one-half percent.
VOA : special.2009.04.24
For example, F x y z if I have an equation that looks like this, f of x, y, z.
打个比方，我有个这样的方程。
固态化学导论课程节选 : 麻省理工公开课
printf I have my includes, standard IO's; so I can use print F, but then I had this thing called a prototype.
我包含了标准输入输出文件，所以我可以使用，然后我有这个原型。
计算机科学课程节选 : 哈佛公开课
The American Food and Drug Administration says R.F.I.D.tags act like an electronic safety net to make it easier to catch counterfeits.
VOA : special.2010.03.01
Martin Edwards is an assistant professor at Seton Hall University in New Jersey who has written about the I.M.F.
VOA : special.2009.10.02
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。