abbr.当且仅当(=if and only if)
IFF.
abbr.敌我识别器(=Identification；Friend or Foe)
Solution: IFF inoperative in OFF mode. 解决：IFF无法操作已关掉。
ETrue iff the editable state can be left. 如果可编辑的状态可以离开返回。
IFF always inoperative in OFF mode. 甚高频在关闭模式下当然不能用。
Iff you look back, your journey is ended. 如果你向后看，你的旅程已经终结。
It also has 4 IFF antenna dipoles across the top of the bedspring. 在天线顶端还有4组IFF偶极天线。
