单词iff
conj.: 当且仅当；在而且只有在…时
abbr.: (=identification): friend or foe 【军事】敌我识别器
网络: 国际金融论坛(International Finance Forum)；敌我识别器(Identification Friend of Foe)；敌我识别系统
当且仅当；在而且只有在…时:
an expression used in mathematics to mean ‘if and only if’
I WISH MORE PEOPLE CAN JOIN IN THE FESTIVITY OF THE IFF, AND MAKE IT A CELEBRATED EVENT OF THE YEAR.
我希望市民多点参加电影节，令电影节的气氛更为热闹，使它真的仿如节日一样。
S is wise iff S believes S does not know anything.
是聪明的当且仅当S相信自己不知道一切。
Definition : A partition P of a database D is TST-hierarchical with respect to Tu iff DHG(P, Tu)is a transitive semi-tree.
定义：一个数据库D分区P是尖沙咀，就涂森林华赋层次性（P，图）是一个传递半树。
Another trick was to activate German planes" IFF transponders, then home in on them and shoot the planes down.
还有一个技巧是打开IFF应答机伪装成德国飞机，然后瞄准并击落他们。
The IFF identifies cooperative targets in the area of operations and enables rapid sorting and prioritization of targets of interest.
IFF系统可识别战斗区域内的联合目标，快速分类和确定目标优先次序。
The IFF had not tracked bonus levels before 2007.
国际金融协会没有追踪2007年之前的奖金发放情况。
how iff I become vice president I"ll need my own good men to work for me.
如果我成为副董事我需要我自己的人来为我工作
Incidentally, the Germans had their own IFF equipment, but it was less sophisticated than ours.
顺带一提，德国人也有他们自己的IFF装备，但远不如我们的完善。
Kurt uploaded Fred"s change of rank, and his IFF icon blinked to the star-and-bar insignia of Lieutenant.
库尔特上载了佛瑞德的军衔变化，他的敌我识别标志闪烁着变成星和杠的上尉徽章。
Defence Electronics has delivered many IFF systems to several NATO nations for ground and naval applications.
防务电子公司已向北约几个国家交付许多敌友识别系统，用于陆军和海军。