An F is a failing grade worth zero toward a student's grade point average.
VOA : special.2009.03.05
Whereas for fluorine, fluorine is smaller than f minus is the one that's the outer shell shown here.
而对于氟来说，氟原子更小,与外部壳层在这的负一价氟离子相比。
化学原理课程节选 : 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
John F.Kennedy, the country's first Roman Catholic president, is sixth on the list.
VOA : special.2009.02.27
Mister Rowan's reports on race relations in the South interested President John F.Kennedy.
VOA : special.2009.11.01
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。