iff
英 [ɪf]
美 [ɪf]
conj. 当且仅当; 在而且只有在…时
BNC.44369 / COCA.36235
牛津词典
conj.
- 当且仅当；在而且只有在…时
an expression used in mathematics to mean ‘if and only if’
双语例句
- 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。 - Application of Side Lobe Suppression Technique in Type ⅱ IFF System
旁瓣抑制技术在Ⅱ型敌我识别系统中的应用 - In this paper, the working principle of IFF system is expatiated and its development process is summarized and retrospected. At the same time, new communication methods, such as laser technology and mm-wave technology used in the IFF system, are also analyzed in detail.
本文阐述了IFF系统的工作原理，并对其发展进程做了总结和回顾，同时详细分析了激光技术、毫米波技术等在IFF系统中的应用。 - IFF signal is a type of signal by which the station on earth can identify the flying plane.
IFF信号是飞机与地面站之间进行相互识别的一种信号，包括询问和应答两种格式。 - The working principle and method of IFF systems were analyzed for a certain type of airplane, and particular study was made on how to implement encoding and decoding of the inquiring and responsive signal.
从某型机的实际工程背景出发，对其协同敌我识别系统的工作原理和实现方法进行了研究，特别对询问、应答信号编码和解码的实现方法进行了探索。 - 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。 - The working principle and coding mode of laser IFF system are analysed. The application of laser countermeasure technology such as intell gence and jamming to the laser IFF system is discussed.
分析了激光敌我识别系统的工作原理和编码方式，探讨了激光对抗在对激光敌我识别系统侦察和干扰中的运用问题。 - A continuous poset has a countable basis iff the measurement topology of it is separable.
连续偏序集有可数基当且仅当其上的测度拓扑是可分的； - IFF is an important part of modern warfare.
敌我识别是现代战争中重要的一环，只有识别到敌方，才能有效的攻击敌方。 - Analyze the uncertainty of the information fusion of the ground-based radar and IFF. Provide a method to describe the uncertainty.
分析在地基雷达和IFF信息融合中存在的不确定性，给出描述这些不确定性的方法。