Stealth fighters currently rely on the shape design and material surface coating to reduce their detectability and achieve radar stealth. However, due to the existing technology and material levels and the difficulty of fighter manufacturing, maneuverability, cost and follow-up costs, and ease of maintenance and guarantee Due to many restrictions, the stealth fighter has to make a certain balance in the above aspects, so it is generally impossible to achieve the so-called full stealth of all-round and full electromagnetic bands, especially when it is performing special tasks, carrying or mounting non-stealth exposed outside the aircraft. In stealth configuration, the stealth ability drops a lot. What does this text mean? ['Introduce the plight of making stealth fighters.', 'Analysis of design flaws of stealth fighter.', 'Exploring the technical difficulties of stealth fighters.', 'Explain the stealth principle of stealth fighter.']