第四代战斗机是各国目前正在研制的最先进的战斗机,四代机的标准通常称为4S标准,是以四个S开头英文单词来表述的,即“超机动性”“超音速巡航”“隐身能力”和“超视距空战”。中美俄都有自己的四代机(俄第五代),不过,只有美国的F22和F35已经服役, The fourth generation of fighter jets is the most advanced fighter aircraft currently under development in all countries. The standard of the fourth generation aircraft, commonly referred to as the 4S standard, is expressed in terms of four English words beginning with “S”, that is, “ultra-mobility” supersonic Cruise “” stealth ability “and ” BVR air ". China, the United States and Russia have their own four generations of machines (the fifth generation of Russia), but only the United States F22 and F35 have been in service,