A day fighter is a fighter aircraft equipped only to fight during the day. More specifically, it refers to a multi-purpose aircraft that does not include equipment for fighting at night (such as a radar and specialized avionics),Britannica states "A day fighter is an airplane in which weight and space are saved by eliminating the special navigational equipment of the night fighter.
网络释义
1、昼间战斗机
... cut a sorry figure 出丑；露出可怜相；显得很不象样 ... day fighter 昼间战斗机 ... escort fighter 护航战斗机 ...