<html lang="zh"><head> <meta charset="UTF-8"> <title>蝴蝶教程（cainiaoya.com）</title></head><body><p>美国国家航空航天局（英语：National Aeronautics and Space Administration，简称 <abbr title="National Aeronautics and Space Administration">NASA</abbr> /ˈnæsə/）</p></body></html>