我在谷歌上问：“How stealthy is B-2?” 里面是谷歌AI的答复：

The B-2 Spirit, also known as the stealth bomber, is considered one of the most stealthy operational aircraft in service today. Its low-observability, or "stealth" characteristics, are a combination of reduced infrared, acoustic, electromagnetic, visual, and radar signatures. These features make it difficult for sophisticated defensive systems to detect, track, and engage the B-2, allowing it to penetrate enemy defenses and attack heavily defended targets. 

 

Here are some of the B-2's stealth features:

• Flying-wing design 

  The B-2's flying-wing design is difficult to detect, even by low-frequency early-warning radar arrays 
• Buried engines 

  The B-2's engines are buried within its wing to minimize their exhaust signature and thermal visibility 
• Anti-reflective paint 

  The B-2's anti-reflective paint helps minimize its visibility in daylight 
• Dark gray underside 

  The B-2's dark gray underside merges with the sky when flying at high altitudes of 50,000 feet 
• Pedostatic sensing plates 

  The B-2 uses pedostatic sensing plates instead of traditional pitot tubes to gather flight data while enhancing stealth 
• Split break rudders and differential thrust 

  The B-2 uses a blend of split break rudders and differential thrust to minimize radar visibility while maintaining efficiency 

   

Other features of the B-2 include: Composite materials, Special coatings, and Automatic flight surface and setting adjustments.